Ron Vanderhoff   2020-05-17

Location: Upper Trabuco Cyn., Santa Ana Mts.
Orange County

Notes: One very large, old plant, others smaller. Adjacent to cabins. Planted, but now naturalized. A few old flowers.

Ron Vanderhoff   2020-08-27

Location: Aliso Creek, S side, 100m E PCH, Laguna Beach
Orange County

Notes: Established and spreading here for many years. Occupying much of the rock surfaces.

Ron Vanderhoff   2021-05-30

Location: Hot Springs Creek, 400m N USFS Station on SR74, Caspers Park
Orange County

Notes: Three plants together in small clump. Varying ages. Tallest ca 4m. Buds.

Ron Vanderhoff   2021-05-30

Location: Hot Springs Creek, 140m NNW USFS station at SR74, Caspers Park
Orange County

Notes: One plant here. A few others scattered in area. About 3-4m high.

Ron Vanderhoff   2021-01-10

Location: Muirlands Pkwy. 50 m SE of Bake Pkwy., Lake Forest
Orange County

Notes: In urban landscaping.

Ron Vanderhoff   2020-10-25

Location: Doheny State Park, near entrance kiosk, Dan Point
Orange County

Notes: Medium-large plant(s).

Ron Vanderhoff   2020-04-02

Location: Vic. Bell View Trail, Robinson Ranch
Orange County

Notes: Plants still emergent.

Ron Vanderhoff   2020-04-02

Location: Vic. Bell View Trail, Robinson Ranch
Orange County

Notes: Scattered near trailhead.

Ron Vanderhoff   2020-12-27

Location: 250 m NNW of mouth of Segunda Deschecha, San Clemente
Orange County

Notes: Scattered dense patches. Either A. lentiformis or amnicola. Approaching A. amnicola in habit, smaller/denser height. But some older branchlets semi-spiny and no fruit to examine.

Ron Vanderhoff   2021-01-19

Location: 400m SE Calle Avena at Avenida Salvador, San Clemente
Orange County

Notes: A few large, mature plants scattered. Collection taken from two separate plants, pistillate and staminate.

Ron Vanderhoff   2021-01-19

Location: 150m SE Calle Avena at Avenida Salvador, San Clemente
Orange County

Notes: A few large, mature plants scattered. Collection taken from two separate plants, pistillate and staminate.

Ron Vanderhoff   2021-05-29

Location: Big Canyon, 75m E Back Bay Drive, Upper Newport Bay
Orange County

Notes: Very common in dense monocultures just to South

Ron Vanderhoff   2020-03-21

Location: Big Canyon, Upper Newport Bay, Newport Beach
Orange County

Notes: Very large, dense monculture on CSS bluff scrub bluffs/slope and in flats. Established here for many years. Little native vegetation persisting. Other smaller colonies scattered in Big Canyon and elsewhere in bay. Mapped polygon is only a general outline of the main population. Others are about. Staminate and pistillate inflorescences collected, separate plants.

Ron Vanderhoff   2020-11-19

Location: San Clemente City Beach, 1000m SE San Clemente Pier, San Clemente
Orange County

Notes: Large clump, but no others found adjacent.

Ron Vanderhoff   2020-11-29

Location: Salt Creek corridor, Club House Dr. to Camino del Avion, Laguna Niguel
Orange County

Notes: Northern tip of large colony on hi;slide.

Ron Vanderhoff   2020-11-29

Location: Salt Creek corridor, 100m NW of Niguel Rd. at Ridgeway Ave., Laguna Niguel
Orange County

Notes: Common to abundant in large, dense monoculture colonies. Other plants/colonies scattered in region.

Ron Vanderhoff   2020-11-29

Location: 100m E San Juan Creek at Stonehill Drive, Dana Point
Orange County

Notes: Several.

Ron Vanderhoff   2020-01-02

Location: Flanagan Road, nr. Rose Canyon, Santa Ana Mts.
Orange County

Notes: Re-assessed and correctly keyed to this taxon. Rhombic bracteoles, variable leaves (some with hastate bases, many without). Plants dioecious. It appears the plants may have been introduced during landscaping/vegetation to the slopes and buffer areas along the roadway. Also present is extensive Limonium perezii, Cistus, remnant Gazania.

Ron Vanderhoff   2021-03-07

Location: Harriett Wieder Regional Park, 150m W of parking lot, Seapoint Dr., Huntington Beach
Orange County

Notes: Plants at life stages from seedling rosettes to mature in full flower, with seeds dropping. Largest plants to .8m H x 1.5m W, woody at base, clearly perennial. Original detection 03-18-2020 by Jesse Potter, Bolsa Chica Conservancy. Management to begin immediately by OC Parks.

Ron Vanderhoff   2020-03-01

Location: Caspers Park, nr San Juan Creek crossing
Orange County

Notes: A couple 0f plants noted on steam bank.

Ron Vanderhoff   2021-02-21

Location: San Juan Creek, ca 2 km SW Hot Springs Cyn. Rd., S of SR74, Caspers Park
Orange County

Notes: Common through much of the wash.

Ron Vanderhoff   2021-02-21

Location: San Juan Creek, 1.5-2.25 km SW Hot Springs Cyn. Rd., S of SR74, Caspers Park
Orange County

Notes: Common, esp. in patches, through much of the wash.

Ron Vanderhoff   2021-03-04

Location: San Juan Meadow Campground, Caspers Park
Orange County

Notes: In patches through area.

Ron Vanderhoff   2021-03-18

Location: Rancho Carrillo Rd., 2.9 rd. mi E SR74, Caspers Park
Orange County

Notes: Very common along roadside.

Ron Vanderhoff   2021-03-18

Location: Rancho Carrillo Rd., 1 rd. km E intersection of SR74, Caspers Park
Orange County

Notes: Common along roadway.

Ron Vanderhoff   2021-03-18

Location: Rancho Carrillo Rd., 2.9 rd. mi E SR74, Caspers Park
Orange County

Notes: Common along roadside.

Ron Vanderhoff   2021-03-18

Location: San Juan Creek. 200m W SR74 crossing, Caspers Park
Orange County

Notes: Common through the wash.

Ron Vanderhoff   2021-04-18

Location: Boreggo Wash, SW of Hwy 241, Foothill Ranch
Orange County

Notes: Very common throughout.

Ron Vanderhoff   2021-01-21

Location: Adjacent Irvine Ranch Conservancy Native Seed Farm, N end, off Jeffrey Rd, Irvine
Orange County

Notes: Naturalized.

Ron Vanderhoff   2021-01-23

Location: Marine Way, 20m W SR133, nr. Great Park, Irvine
Orange County

Notes: Several plants scattered in area. Present for several years.

Ron Vanderhoff   2020-05-10

Location: Jeffrey Road. at I405 Fwy., Irvine
Orange County

Notes: Full flower. Plants averaging 4-5 feet. Growing in and through Brassica nigra.

Ron Vanderhoff   2020-07-16

Location: San Juan Creek Trail and SR74, 250 N of entrance road to Quest Diagnostics, Caspers Park
Orange County

Notes: Small, concentrated colony over 18 sq. meters. Originally detected by James Bailey. Plants in bloom but probably not yet reproductive. Between San Juan Trail across fence and on Caltrans property. C. melitensis in nvicinity. None found to 200 m N on either side of SR74. Needs urgent management. Most plants small.

Ron Vanderhoff   2020-07-23

Location: Hw. 74, 700 rd. mi SW Orange/Riverside Co. line, Santa Ana Mts.
Orange County

Notes: Previously many more. Pulled.

Ron Vanderhoff   2020-07-26

Location: Silverado Canyon Rd, Corona, CA 92883, USA
Orange County

Notes: Colonies scattered over approx. 1 mi of roadway and all under management since 2016. Numbers greatly reduced from LY.

Ron Vanderhoff   2020-08-06

Location: Aliso Cyn., 450m NE Wood Canyon intersection, S side of creek at crossing, Aliso-Wood Cyn., Park
Orange County

Notes: Colony first discovered this spring and now under management by OC Parks or Laguna Canyon Foundation. Plants recently removed. 48 additional very small plants removed, many with flowers.

Ron Vanderhoff   2021-07-01

Location: Silverado Canyon, .2 to .5 mi E of USFS gate. Santa Ana Mountans
Orange County

Notes: 23 found and pulled.

Ron Vanderhoff   2021-07-01

Location: Silverado Canyon, .82 rd. mi E of USFS gate. Santa Ana Mountains
Orange County

Notes: 10 found and pulled.

Ron Vanderhoff   2021-07-03

Location: San Juan Creek Trail and SR74, 250 N of entrance road to Quest Diagnostics, Caspers Park
Orange County

Notes: 6 plants found and pulled. All small (<.5m) due to dry winter/spring. Plants in early bloom, not reproductive.

Ron Vanderhoff   2021-01-28

Location: Santiago Canyon, from end of paved road to 2 air km SE, Santa Ana Mts.
Orange County

Notes: Adjacent to cabin.

Ron Vanderhoff   2021-03-14

Location: San Juan Creek, 50m E of junction with Hot Springs Creek, Caspers Park
Orange County

Notes: Plants are scattered widely through the area, to at least .6km West.

Ron Vanderhoff   2021-04-25

Location: San Juan Creek, 200m S confluence of Cold Springs Creek, Caspers Park, Santa Ana Mts.
Orange County

Notes: Single plant. Others scattered through area.

Joan Miller   2025-03-08

Location: Off Wesley Dr in Laguna Beach. East side of access road next to closed Gelson store.
Orange County

Ron Vanderhoff   2020-12-26

Location: Bluffs adj to Montage Hotel, S. Laguna
Orange County

Notes: At edge of urban landscaping of Montage Hotel.

Ron Vanderhoff   2021-10-07

Location: Mouth of Aliso Creek, 60-180m E Hwy. 1, Laguna Beach
Orange County

Notes: Single plant in landscape.

Ron Vanderhoff   2021-10-07

Location: Mouth of Aliso Creek, 60-180m E Hwy. 1, Laguna Beach
Orange County

Ron Vanderhoff   2020-08-27

Location: Aliso Creek, N side, 50m E PCH, Laguna Beach
Orange County

Notes: See prior entries. Well established and expanding. Most plants on N side of Country Club Drive, but likely moving toward the estuary here.

Ron Vanderhoff   2020-08-27

Location: Aliso Creek, S side, 100m E PCH, Laguna Beach
Orange County

Notes: See prior entries. Well established and expanding. Most plants on N side of Country Club Drive, but likely moving toward the estuary here.

Ron Vanderhoff   2020-08-27

Location: Aliso Creek, N side, 50m E PCH, Laguna Beach
Orange County

Notes: See prior entries. Well established and expanding. Most plants on N side of Country Club Drive, but likely moving toward the estuary here.

Ron Vanderhoff   2020-08-27

Location: Aliso Creek, N side, 80m E PCH, Laguna Beach
Orange County

Notes: See prior entries. Well established and expanding. Most plants on N side of Country Club Drive, but likely moving toward the estuary here.

Ron Vanderhoff   2020-08-27

Location: Aliso Creek, N side, 150m E PCH, Laguna Beach
Orange County

Notes: See prior entries. Large plants here. Most plants on N side of Country Club Drive, but likely moving toward the estuary here.

Ron Vanderhoff   2021-03-07

Location: Pacific Coast Hwy, 1.1km NW Seapoint Drive, Bolsa Chica, Huntington Beach
Orange County

Notes: Single semi-mature plant in full flower. Waif. With woody base, estimated three years old. Pulled.

Ron Vanderhoff   2021-06-17

Location: Whiting Ranch Wilderness Park, Borrego Trail
Orange County

Notes: Colony is becoming denser, but does not appear to be enlarging. This taxon has had confused taxonomy. Various references ascribe it as Colocasia esculenta var. fontanesii, others as Colocasia fontanesii. Kew Plants of the World and the paper "Two new species and a new record for Colocasia (Araceae: Colocasieae) from Arunachal Pradesh, Northeast India, R. Gogoi1 and S. Borah2, Gardens’ Bulletin Singapore 65(1): 27–37. 2013", both support the full species, Colocasia fontanesii. which appears legitimate and matches these plants. Changing my determination. Plant robust, to 2+ m tall; petiole and peduncle deep purple red; spathe 12-15cm, leaves glossy, bronzed/purple wash.

Ron Vanderhoff   2021-10-26

Location: San Diego Creek Channel, Laguna Cyn. Rd. To San Canyon Rd., Irvine
Orange County

Notes: Flowering. Annual; plant open, straggling and irregularly upright, to .9m high and wide; leaf blades ca 10-14cm long, 5-8 mm wide; ligules ca 2-3mm, somewhat shredded; inflorescences terminal, 15-30cm.; rachises elongated, to 8.5cm at base small at tip, 60-80 per inflorescence, widely spreading from central stem, pendant with maturity, reddish; spikelets slightly flattened, congested; glumes long, with 2-3mm awn-like tip, strongly acuminate, rolled/keeled. See additional notes 2021-10-24, mu20440. 8 plants removed. A few others left behind. A storm event 24hrs earlier made the identifications/assessment difficult.

Ron Vanderhoff   2021-05-13

Location: Country Club Rd., SE side, 50m N PCH, Aliso Canyon Laguna Beach
Orange County

Notes: Detected 2020 by James Bailey. Full flower, with numerous unripe seed, a few ripe/reproductive seed. Spreading colony, now over approx. 50-75 sq. meters. Overtopping Encelia californica, Eriogonum fasciculatum and up Nicotiana glauca. Needs management.

Ron Vanderhoff   2021-10-07

Location: Mouth of Aliso Creek, 60-180m E Hwy. 1, Laguna Beach
Orange County

Notes: See earlier observations.

Ron Vanderhoff   2020-08-27

Location: Aliso Creek, S side, 60m E PCH, Laguna Beach
Orange County

Notes: Colony detected by James Bailey about 14 days ago. Well established, twining and scrambling over aver approx. 100-150 sq. meters.

Joan Miller   2023-08-12

Location: Dry wash along Trabuco Creek Rd
Orange County

Joan Miller   2023-08-31

Location: East side of Oso Creek above Marty Russo Youth Athletic Park
Orange County

Notes: 8/31: Frequently in heavy clover. 116 plants hand pulled. 10/14: recheck. pulled 8 plants. now in flower.

Joan Miller   2023-08-31

Location: Concrete channel of Oso Creek at Marry Russo Youth Athletic Park. West side.
Orange County

Notes: Hand pulled

Joan Miller   2023-08-31

Location: On HOA slope next to Oso Creek riparian area
Orange County

Notes: Hand pulled.

Joan Miller   2023-08-31

Location: On HOA slope next to Oso Creek riparian area
Orange County

Notes: Hand pulled

Joan Miller   2023-09-01

Location: On Oso Creek bank. Used to be a stream crossing but currently not passable.
Orange County

Notes: hand pulled

Joan Miller   2023-09-01

Location: Mowed exotic forbland
Orange County

Notes: 9/6. Hand pulled 660 plants. 10/14: Final check 75 more plants.

Joan Miller   2023-09-01

Location: Pinecrest Park. Oso Creek slope near Santa Margarita Pkwy and Pinecrest Dr.
Orange County

Notes: Hand pulled

Joan Miller   2023-09-08

Location: Under the 241 near the corner of Marguerite Pkwy and El Toro Rd
Orange County

Notes: hand pulled. nothing in flower.

Joan Miller   2023-09-08

Location: Along the fence at the San Clemente train station/North Beach
Orange County

Joan Miller   2023-09-08

Location: In rocks at the northwest end of North Beach, San Clemente
Orange County

Joan Miller   2023-09-08

Location: In the rocks on the east side of the North Beach train crossing
Orange County

Joan Miller   2023-09-08

Location: Entrance roadway near Portola Rd to the Serrrano Creek Trail
Orange County

Notes: used hand pick to remove plants in gravel road

Joan Miller   2023-09-08

Location: North side of bike trail under 241
Orange County

Notes: hand pulled

Joan Miller   2023-09-08

Location: Access road to 241 east of Saddleback Church
Orange County

Notes: hand pulled

Joan Miller   2024-09-06

Location: Park Boundary - Whiting Ranch Wilderness Park: Social trail running above the Aliso Creek Bikeway at the 241
Orange County

Notes: Hand pulled

Joan Miller   2024-09-06

Location: Under the 241 near Marguerite and El Toro Rds
Orange County

Notes: Hand pulled. Not yet in flower.

Joan Miller   2024-09-06

Location: Access road to the 241
Orange County

Notes: Hand pulled

Joan Miller   2024-09-06

Location: Under the 241 near El Toro and Marguerite Rds
Orange County

Notes: Hand pulled. Nothing in flower

Joan Miller   2024-09-06

Location: East side of Aliso Creek bikeway
Orange County

Notes: hand pulled. Not yet in flower.

Joan Miller   2024-09-15

Location: Cut meadow of non-native grasses and forbs. NE end of Oso Creek drainage in Pinecrest Park.
Orange County

Notes: Bagged anything with flowers

Joan Miller   2024-09-15

Location: Along social trail in meadow. North end of Pinecrest Park
Orange County

Notes: Bagged anything with flowers

Joan Miller   2024-09-15

Location: Marty Russo Athletic Park. At the north gate into the riparian area.
Orange County

Notes: On both sides of the gate

Joan Miller   2024-09-15

Location: Riparian drainage in Pinecrest Park near the corner of Pinecrest and Santa Margarita Pkwy.
Orange County

Notes: Hand pulled. Flowers bagged

Joan Miller   2024-09-15

Location: Oso Creek riparian corridor between La Barca and Santa Margarita Pkwy
Orange County

Notes: Now crowded with Pulicaria paludosa and Ambrosia psilostachya. Area has no water.

Joan Miller   2024-09-15

Location: Cement supported bank at the south end of Oso Creek thru Pinecrest Park
Orange County

Notes: Bagged

Joan Miller   2024-09-15

Location: Marty Russo Sports Park. Developed drainage banks next to ball fields.
Orange County

Notes: Hand pulled. Bagged any flowers

Joan Miller   2024-09-15

Location: Gravel pad at the north end of Oso Creek as it goes thru Pinecrest Park
Orange County

Joan Miller   2024-09-15

Location: Road leading to the north end of the Pinecrest Park riparian corridor
Orange County

Joan Miller   2024-10-27

Location: In the rocks on the south side of the pedestrian crossing
Orange County

Notes: Hand pulled and bagged

Bob Sill   2024-11-04

Location: 133 west side between Laguna Cyn Rd and Lake Forest Dr.
Orange County

Joan Miller   2021-08-19

Location: In dry riparian channel of Oso Creek, Mission Viejo. With Baccharis salicifolia and Ambrosia psilostachya.
Orange County

Notes: 8/19/21: Heavy cover of DITGRA. Estimate 2000+ plants. A few of the largest plants beginning to bolt, but most still seedlings. Underneath the large plants are numerous small plants. Hand pulled all the plants. 8/26/21: Reworked the outbreak. 10/01/21: Final Pull. Still found lots of small to moderate plants in mostly thick vegetation. All in flower. Bagged all plant material. Pulled 2 bags.

Joan Miller   2021-08-22

Location: Oso Creek wash on north side of Santa Margarita Parkway (Pinecrest Park)
Orange County

Notes: 8/22/21: First Pull. Up the banks of the creek. At the bottom of the creek wash moving east. All plants hand pulled. Heaviest on the west side of the outbreak near the corner of Santa Margarita Pkwy and Pinecrest. Small dense patches moving west along the channel. 10/01/21: Final Pull. Stopped counting. Filled 1.5 42-gal bags. Plants of all sizes, including some that were only a few inches tall. Everything in flower. No seed seen. All plant material bagged.

Joan Miller   2021-08-22

Location: Next to the sidewalk on Santa Margarita Parkway
Orange County

Notes: Hand pulled.

Joan Miller   2021-08-22

Location: Oso Creek: Deep in the creek bed north of Pinecrest Park
Orange County

Notes: 8/22/21: 350 plants. Hand pulled. Second Pull 10/01/21: 50 more plants. Small. Now in flower. Everything bagged. Nothing in seed.

Joan Miller   2022-07-23

Location: Oso Creek wash on north side of Santa Margarita Parkway (Pinecrest Park)
Orange County

Notes: 7/3/22: First pass. Checked the eastern end of the creek channel and banks. Plants tiny. Most of the plants were removed on the slope opposite the park. Nothing seen yet in the channel. 7/23/22: 2nd pass. Removed 223 seedlings. Area looks considerably better than prior years.

Joan Miller   2022-07-23

Location: Oso Creek at the north end of Pinecrest Park
Orange County

Notes: Hand pulled.

Joan Miller   2022-07-23

Location: Oso Creek just north of Pinecrest Park.
Orange County

Joan Miller   2022-07-23

Location: Trail from Pinecrest Park north along Oso Creek
Orange County

Joan Miller   2022-07-23

Location: Oso Creek north of Pnecrest Park
Orange County

Joan Miller   2022-07-23

Location: Oso Creek trail near Los Alisos Blvd
Orange County

Ron Vanderhoff   2020-12-27

Location: 250 m NNW of mouth of Segunda Deschecha, San Clemente
Orange County

Notes: Plants common but patchy throughout area S to Pico. Plants dead, but still lightly seeding

Ron Vanderhoff   2020-12-27

Location: 250 m NNW of mouth of Segunda Deschecha, San Clemente
Orange County

Notes: Plants common but patchy throughout area S to Pico. Plants dead, but still lightly seeding

Joan Miller   2020-09-09

Location: Along the Oso Creek trail between Santa Margarita Parkway and La Barca Road.
Orange County

Notes: Hand pulled plants. Flowers not yet formed.

Joan Miller   2020-09-09

Location: In the Oso Creek dry drainage north of La Barca Rd
Orange County

Notes: Plants were hand pulled. Not yet in bloom.

Joan Miller   2020-09-22

Location: Exposed Oso Creek channel between Marty Russo Youth Athletic Park and La Barca Road in Misson Viejo
Orange County

Notes: Approval by the City of Mission Viejo to have volunteers remove Dittrichia in the Oso Creek channel. Seven volunteers participated in the removal over 2 days. The Dittrichia was in a sandy and mostly shady riparian water channel, growing intermixed wth Spanish sunflower (Pulicaria paludosa). Plants were budding and just beginning to flower. All plants in the channel were easily hand pulled and bagged. We removed forty 42-gal bags of material. Between the riparian area and the ball field, the stream passed through a deep dirt/gravel-walled channel. We pulled what we could. For the large plants, however, we tried a weed wacker but found the best solution was to cut them at ground level with hand loppers. Because the cut material was in the sun and there were very few flowers, it was left on the ground to dry out. Removal of the outbreak took 54 volunteer hours. Recheck 10/1/20 The plants left to dry out are dead. No evidence of flowers or seed.

Joan Miller   2020-09-30

Location: South side of Trabuco Creek Rd near the Trabuco Canyon Rd intersection
Orange County

Notes: Growing along a bike trail and near a truck passage to a power pole. Dense population of mostly small plants. 500 plants were already dead. We pulled another 1000 plants, of which 750 were less than 6 inches tall. The remaining plants were in bloom and were bagged. We also removed about 10 plants along the edge of Trabuca Creek Rd immediately adjacent to this outbreak. The lower wash was carefully surveyed for more Dittrichia. No more Dittrichia found.

Joan Miller   2021-07-28

Location: Exposed Oso Creek channel between Marty Russo Youth Athletic Park and La Barca Road in Misson Viejo
Orange County

Notes: 7/28/21: Hand pulled 100 DITGRA seedlings in the packed earth slopes and roadway edges below the riparian area. Pulicaria paludosa (Spanish sunflower) has become a monoculture in all open spaces of the riparian drainage. No DITGRA found in the riparian area on this visit. 8/19/21: Sweep 2 of area. Removed 144 more plants in the cement/gravel drainage. Checked riparian area for DITGRA. Some plants 8-12 inches high in slightly open areas. Still very hard to see in the Pulicharia. 9/3/21: Worked riparian area from the sports park all the way up to the park next to La Barca. Heavy with Pulicharia. Pulled 400 tiny, leggy DITGRA. A few had buds and were bagged. 4 x 2.5 hrs.

Joan Miller   2021-08-05

Location: South side of Trabuco Creek Rd near the Trabuco Canyon Rd intersection
Orange County

Notes: 8/5/21: Hand pulled 185 plants from path and immediate edges. Some tiny plants. Slowly drove Trabuco Creek Road to the end, searching for DITGRA on the edges. Removed 1 plant on the roadway close to the outbreak. 8/17/21: Second sweep of outbreak area. Found 12 tiny plants. Hand pulled.

Joan Miller   2021-08-22

Location: On gravel pad near Oso Creek culvert at Los Alisos Blvd
Orange County

Notes: Hand pulled

Joan Miller   2021-08-22

Location: On gravel pad near Oso Creek culvert by Los Alisos Blvd
Orange County

Notes: Hand pulled

Joan Miller   2021-08-22

Location: In the dry Oso Creek wash
Orange County

Notes: Hand pulled

Joan Miller   2021-08-26

Location: 8/26/21: Oso Creek just north of Pinecrest Park. No flowers. Did not bag. 10/01/21: Final Pull. 14 plants. In bloom. Everything bagged.
Orange County

Notes: 75 plants. Hand pulled. Deep in the ravine.

Joan Miller   2021-08-26

Location: Oso Creek at the north end of Pinecrest Park
Orange County

Notes: Hand pulled.

Joan Miller   2021-08-26

Location: Dry creekbed of Oso Creek.
Orange County

Notes: Hand pulled.

Joan Miller   2021-08-26

Location: Oso Creek on roadway by riparian area.
Orange County

Notes: Hand pulled.

Joan Miller   2021-08-26

Location: Oso Creek on the side road
Orange County

Notes: Hand pulled.

Joan Miller   2021-08-26

Location: Oso Creek on roadway nwxt to riparian area.
Orange County

Notes: Hand pulled.

Joan Miller   2021-09-05

Location: San Clemente North Beach next to Metrolink tracks
Orange County

Joan Miller   2021-09-05

Location: San Clemente North Bach by pedestrian cross over the tracks
Orange County

Joan Miller   2021-09-05

Location: San Clemente: Streets edges below the east side of outlet malls. Mostly in moist soils.
Orange County

Notes: Most plants easily accessible along roadway edges. Favored moist drainage soils. Some plants had evidence of some lost seed on the undersides of the plants. Top upper branches just showing flowers. Plant material bagged.

Joan Miller   2021-09-08

Location: San Clemente: Pico Park
Orange County

Notes: Growing in the lawn. Being cut during mowing. A couple inches high. Removed.

Joan Miller   2021-09-08

Location: San Clemente: Pico Park
Orange County

Notes: Small scattered plants. Removed.

Joan Miller   2022-07-03

Location: Exposed Oso Creek channel between Marty Russo Youth Athletic Park and La Barca Road in Misson Viejo
Orange County

Notes: 7/3/22: First pass. Checked the riparian area and east side of concrete channel, but no plants seen. Riparian area overgrown with Pulicaria paludosa.

Joan Miller   2022-07-04

Location: In dry riparian channel of Oso Creek, Mission Viejo. With Baccharis salicifolia and Ambrosia psilostachya.
Orange County

Notes: 7/3/22: First check. Considerably fewer plants compared to last year. Still very small. 7/17: Hand pulled plants. All seedlings. Nothing bolted.

Joan Miller   2022-07-03

Location: Oso Creek dry channel between La Barca and Santa Margarita Pkwy.
Orange County

Notes: 7/3/22: First pass. Hand pulled 110. 7/17: Second pass. Hand pulled 47.

Joan Miller   2022-07-03

Location: Oso Creek wash on north side of Santa Margarita Parkway (Pinecrest Park)
Orange County

Notes: 7/3/22: First pass. Checked the eastern end of the creek channel and banks. Plants tiny. Most of the plants were removed on the slope opposite the park. Nothing seen yet in the channel.

Joan Miller   2022-07-05

Location: San Clemente: Streets edges below the east side of outlet malls. Mostly in moist soils.
Orange County

Notes: Checked all the area of the reference polygon. Plants now found in only several spots. Nothing in bloom.7/28/22: Recheck. Found 6 seedlings. 10/9/22: 20 more in flower

Joan Miller   2022-07-05

Location: San Clemente: Pico Park
Orange County

Notes: 7/5: First pass clearing area. 7/28/22: Recheck. Removed about 10 tiny seedlings.

Joan Miller   2022-07-06

Location: San Clemente North Bach by pedestrian cross over the tracks
Orange County

Notes: Good sized plants. A few plants were budding/in flower, and these were bagged. The rest of the plants were left to dry on the ground. 728/22: Rechecked. All clear. 10/9/22: Clear

Joan Miller   2022-07-06

Location: San Clemente North Beach next to Metrolink tracks
Orange County

Notes: Just in time. Many plants with buds and in flower. A few plants already lost seed. Bagged anything with buds, flowers or seed. 1/2 bag. 7/28/22: Rechecked. All clear. 10/9/22: Clear

Joan Miller   2022-07-07

Location: South side of Trabuco Creek Rd near the Trabuco Canyon Rd intersection
Orange County

Notes: Still small. Site needs to be checked again in a few weeks.

Joan Miller   2022-07-07

Location: Disturbed gravel a the corner of Trabuco Canyon Rd and Trabuco Creek Rd
Orange County

Joan Miller   2022-10-09

Location: Pico Park along fence
Orange County

Joan Miller   2023-09-01

Location: Oso Creek trail near Los Alisos Blvd
Orange County

Notes: hand pulled

Joan Miller   2023-09-01

Location: On gravel pad near Oso Creek culvert by Los Alisos Blvd
Orange County

Notes: hand pulled

Joan Miller   2023-09-01

Location: On gravel pad near Oso Creek culvert at Los Alisos Blvd
Orange County

Notes: hand pulled

Joan Miller   2023-09-01

Location: Mix of sage scrub/riparian. Water pools in this area but no flowing stream. At the time of removal, there was still shallow standing water between the trails on the north end.
Orange County

Notes: 9/6. Hand pulled 150 plants. Heavily overgrown with Pulicaria paludosa. 10/14: removed an additional 80 plants. Now in bloom. Material bagged.

Bob Sill   2024-09-24

Location: Entrance from Towne Centre and Portola
Orange County

Ron Vanderhoff   2020-10-25

Location: Village Pond Road, freshwater pond, San Juan Capistrano
Orange County

Notes: Single plant. Likely recently dumped from a homeowner. Removed.

Ron Vanderhoff   2021-01-17

Location: Beach, 50-100m SE Santa Ana River mouth, Newport Beach
Orange County

Notes: Common. Many seedlings.

Bob Sill   2024-11-04

Location: Grassy slope 200 m southwest of intersection of Hwy 133 and Lake Forest Dr
Orange County

Notes: Isolated dense patch, noticeably reddish

Ron Vanderhoff   2021-05-20

Location: O’Neill Regional Park, 125m N Live Oak Trail and 500m E Meadow Ridge Drive
Orange County

Notes: Detected by Johnny Iglesias 2021-05-19. Local, but dense over ca 200 sq. meters. Plants at various ages, with many young seedlings. Est. 500-1000 individuals. Heavy flowering, but seed probably not yet reproductive (uncertain). Erect perennial; leaves & stem glabrous, proximal leaves sessile, lanceolate, basal 20% irregularly somewhat serrulate, mid vein present, tip acute to ovate; inflorescence five-branched in a whorl, bracts ovate in pairs, with slightly reniform base, minutely serrulate margin.

Ron Vanderhoff   2020-03-21

Location: Big Canyon, Upper Newport Bay, Newport Beach
Orange County

Notes: Two patches and a few scattered on weedy CSS bluff scrub slope. Appears to possibly have supplemental urban irrigation runoff. Full flower. With Tropaeolum majus, Acacia redolens, Hordeum vulgare, Encelia californica, Artemisia californica, etc. First reported here in 1990’s by DeRuff, relocated in 2017 by myself and James Bailey.

Ron Vanderhoff   2022-11-27

Location: Beginning of Boat Cyn. Trail, nr. Dartmoor St, Laguna Beach
Orange County

Notes: Colony is under management by OC Parks and Joan Miller team. About 6 mostly quite small plants found at immediate edge of culvert.

Ron Vanderhoff   2020-06-08

Location: Beginning of Boat Cyn. Trail, nr. Dart or St, Laguna Beach
Orange County

Notes: Originally detected 2.5 km NE in 2017 - very small population. Plants here are mature, woody and a few years old. Along roadside in disturbed soils. Under management by Joan Miller and LCF volunteers.

Ron Vanderhoff   2020-05-17

Location: Holy Jim Cyn., nr. Trabuco Cyn., Santa Ana Mts.
Orange County

Notes: At cabins 17 and 22. 3 semi-mature plants adjacent to forest cabins. Largest 2 meters high with 3” diameter trunks. Plants appear to be slightly rhizomatous, with several trunks. Originally detected by Lance Criley, USFS. Visited in 2019, but now several plants appear to have been removed, but not all. Many first or second year seedlings adjacent to mature plants. Easily confused with G. stenopetala. Leaflets silky hairy adaxially and abaxially (slightly more so abaxially), obovate. Calyces densely silky hairy. Notched banner; keel petal short hairy, banner and wing petals glabrous. When contrasted with G. stenopetala this appears to have fewer flowers (4-10), on side shoots, and in more dense inflorescences. Fruit ca 1.9 cm x 3-4 mm, densely long hairy.

Ron Vanderhoff   2021-03-14

Location: Hot Springs Cyn., 150m W USFS Fire Station, Caspers Park
Orange County

Notes: Small clump over 2 sq. meters.

Ron Vanderhoff   2020-04-05

Location: Nr. La Novia Ave., E Valley Rd., San Juan Capistrano
Orange County

Notes: Well established here for 20-30 years. Nature plants. Scaterred in dense patches over a large area. See other records. Very early in bloom.

Ron Vanderhoff   2020-05-12

Location: Between Skyline Dr. and Sawdust Festival, Laguna Beach
Orange County

Notes: Three plants found scattered on hillside. One here. At least two of three were resprouts from stump cuts.

Ron Vanderhoff   2020-05-12

Location: Between Skyline Dr. and Sawdust Festival, Laguna Beach
Orange County

Notes: Three plants found scattered on hillside. One here growing adjacent to private property.

Ron Vanderhoff   2020-05-12

Location: Between Skyline Dr. and Sawdust Festival, Laguna Beach
Orange County

Notes: Three plants found scattered on hillside. One here. At least two of three were resprouts from stump cuts.

Ron Vanderhoff   2021-05-30

Location: Nr. La Novia Ave., E Valley Rd., San Juan Capistrano
Orange County

Notes: The colony here on both sides of La Novia was scraped 1-2 years ago, for future development plants. Not with any intention of managing these plants. They are essentially all re-sprouted and average about 1m in height. Beginning of bloom. Some plants further E were not cut.

Ron Vanderhoff   2020-03-19

Location: W end of Ridge Route a Drive, Laguna Hills
Orange County

Notes: Well established through through drainage, but in patches.

Ron Vanderhoff   2020-03-19

Location: W end of Ridge Route a Drive, Laguna Hills
Orange County

Notes: Well established through through drainage, but in patches. One flower.

Ron Vanderhoff   2021-05-29

Location: Big Canyon, 150m E of Back Bay Dr., Upper Newport Bay
Orange County

Notes: Long established at this small colony. Flowering. L. ramosissimum not co-occurring here, but in vicinity.

Ron Vanderhoff   2021-06-12

Location: San Diego Creek Channel, 100m W SR73, Newport Beach
Orange County

Notes: Common in dense, local patch.

Ron Vanderhoff   2021-02-25

Location: 65 mi E mouth of Santa Ana River, Newport Beach, at small saltwater slough
Orange County

Notes: Occasional, but not common.

Ron Vanderhoff   2020-05-20

Location: Little Corona Beach, Corona del Mar
Orange County

Notes: Common on slope, probably from landscaping, but now thoroughly naturalized.

Ron Vanderhoff   2021-05-30

Location: Hot Springs Creek, 460m N USFS Station on SR74, just N of Caspers Park
Orange County

Notes: Common.

Ron Vanderhoff   2021-03-07

Location: Urban area, 50m SW intersection of Huntington St and Geneva Ave, Huntington Beach
Orange County

Notes: Common throughout neighborhood as a naturalized weed.

Ron Vanderhoff   2021-06-12

Location: San Diego Creek Channel, Jamboree to SR73, Newport Beach
Orange County

Notes: Plants cut to soil during some version of a restoration. But re-growing from root.

Ron Vanderhoff   2020-05-20

Location: Little Corona Beach, Corona del Mar
Orange County

Notes: Common through wet soil near mouth of Buck Gully. Plants clonal - difficult to assess a count.

Ron Vanderhoff   2021-06-10

Location: Between SR74 and San Juan Trail, 110m SSW San Juan Creek crossing, Caspers Park
Orange County

Notes: Detected by Matt Major, OC Parks 2020(?). Early in flower.

Ron Vanderhoff   2020-12-27

Location: E ridge above of Segunda Deschecha, at SW side of Avenida Hermosa, San Clemente
Orange County

Notes: Single found plant. Removed. Sepals more or less equal in width. Not markedly unequal (largest ± 2 × smallest in width)

Ron Vanderhoff   2021-05-30

Location: Hot Springs Creek, 80m NNW USFS station at SR74, Caspers Park
Orange County

Notes: Single tree and another slightly larger about 50m S. Two cones, one open. Cones held slightly appressed toward trunk.

Ron Vanderhoff   2021-05-30

Location: Hot Springs Creek, 140m W USFS station at SR74, Caspers Park
Orange County

Notes: Single tree and another slightly younger about 50m N. No cones.

Ron Vanderhoff   2021-03-21

Location: San Juan Creek, 150m SSE of Nature Center, Caspers Park
Orange County

Notes: Small clump of nine plants at various ages over ca 4 sq. meters. Completely vegetative with no evidence of flowers or fruit. Many dead branches.

Ron Vanderhoff   2020-04-09

Location: Oso Creek, Lake Mission Viejo to Santa Margarita Pkwy., Mission Viejo
Orange County

Notes: Collected. Single med large plant in native habitat, clearly a volunteer. Several (20?) in an adjacent park about 200 m South. Some immature acorns. Plant 3 m tall and wide. Multi trunk at base, with approx 12 trunks.

Ron Vanderhoff   2020-05-19

Location: Delhi Channel, N edge Upper Newport Bay, Newport Beach
Orange County

Notes: Detected by Nathan Taxel, OC Parks. Late in flower. Single plant found, among common Brassica nigra.

Ron Vanderhoff   2020-01-25

Location: Big Canyon area, Upper Newport Bay
Orange County

Notes: A few old, large plants just off slope, in urban edge, bluff scrub. Naturalized. Flower buds, not open.

Ron Vanderhoff   2021-05-29

Location: Big Canyon, Upper Newport Bay, Newport Beach
Orange County

Notes: As happy as ever. Some flowers. Pistillate/female plant.

Ron Vanderhoff   2021-04-18

Location: Boreggo Wash, SW of Hwy 241, Foothill Ranch
Orange County

Notes: Well established colony. Spreading. Flowering and fruiting.

Ron Vanderhoff   2020-05-17

Location: Upper Trabuco Cyn., Santa Ana Mts.
Orange County

Notes: Several other plants scattered through this canyon and A couple in adjacent Trabuco Cyn. Late in bloom.

Ron Vanderhoff   2021-12-19

Location: Trabuco Cyn., nr. Falls Cyn., Santa Ana Mts.
Orange County

Notes: Patch on S side of road on slope. About 4-6 sq. meters.

Ron Vanderhoff   2020-10-11

Location: Constructed bioswale, 100m E San Diego Creek, 100 S I405, Irvine
Orange County

Notes: Ownership/management by Irvine Ranch Water District. Local, but common over 10 sq. meters. Not noted in other portions of the wetland. Ian Swift, IRWD resource manager will initiate management, probably by drying down.

Ron Vanderhoff   2020-12-10

Location: Harding Canyon. Lower 1 mile.
Orange County

Notes: See prior observations. Removed today. Bagged and carried out. Root removed. Plant was in poor condition, but many seed heads were present. No seed, already dispersed.

Ron Vanderhoff   2020-05-22

Location: N corner of Campus Dr. and Anteater Dr., Irvine
Orange County

Notes: Established colony present for several years. Very early in bloom.

Ron Vanderhoff   2020-11-29

Location: Salt Creek corridor, Club House Dr. to Camino del Avion, Laguna Niguel
Orange County

Notes: Plants/colonies throughout drainage.

Ron Vanderhoff   2021-07-15

Location: 26802 Camino Capistrano, Mission Viejo, CA 92691, USA
Orange County

Notes: Several in a weedy disturbed area.

Ron Vanderhoff   2021-07-22

Location: Oso Creek, 50-250m N Oso Parkway, Mission Viejo
Orange County

Notes: Another colony ca 250m South.

Ron Vanderhoff   2021-07-22

Location: Oso Creek, 150m S Oso Parkway, Mission Viejo
Orange County

Notes: Local patch. Another just N Oso Parkway.

Ron Vanderhoff   2021-06-05

Location: Drainage, j SE Irvine Bl at 23rd St., Upper Newport Bay, Newport Beach
Orange County

Notes: Plant still present, but still vegetative. Waiting for flowers to collect a herbarium sample.

Ron Vanderhoff   2020-02-20

Location: Hobo Ridge, nr. Moulton Meadows Park, Laguna Beach
Orange County

Notes: 2-3,plants just outside of landscaped urban edge.

Ron Vanderhoff   2020-07-09

Location: Black Star Cyn., 150m SW Star S gate, Santa Ana Mts.
Orange County

Notes: Detected here by James Bailey, 7-31-18, Calflora #PO92427. All plants within 20 linear meters and of various ages. Largest to 8m tall, with 7-8 trunks, largest 14” diameter ABH. No flowers or fruit found. Primary stems appear jointed, but leaf tips not acute.

Ron Vanderhoff   2021-01-07

Location: Aliso Creek at El Toro Rd., just S of Ridgeline, Foothill Ranch
Orange County

Notes: Well established.

Ron Vanderhoff   2020-04-09

Location: El Horno Creek, at Rancho VIejo Rd., San Juan Capistrano
Orange County

Notes: Extensive through watershed. Well established, probably from an initial planting. Early in leaf.

Ron Vanderhoff   2021-03-11

Location: Trabuco Creek wash, 550m NE SR241, O'Neill Park
Orange County

Notes: One plant noted.

Ron Vanderhoff   2021-05-16

Location: Pinhead Peak Trail, 600m WNW Owl & Quail Campground, Caspers Park
Orange County

Notes: Several patches in area, esp. along trail. Plants mostly still basal rosettes.

Ron Vanderhoff   2020-10-25

Location: Doheny State Beach, Campground area, Dana Point.
Orange County

Notes: Well established through disturbed areas of the campground. Obvious auricles at petiole base. Foliage nearly moncolorous on abaxial/adaxial surfaces. 17-19 ray florets.

Ron Vanderhoff   2020-04-02

Location: Vic. Bell View Trail, Robinson Ranch
Orange County

Notes: Common. Early in bloom.

Ron Vanderhoff   2020-04-05

Location: Nr. La Novia Ave., E Valley Rd., San Juan Capistrano
Orange County

Notes: Well-established colony. Full flower. Assumed from an initial seeding. With Lathyrus odoratus, which is especially common here and widespread.

Ron Vanderhoff   2021-04-08

Location: San Juan Creek, 20m S confluence of Cold Springs Creek, Caspers Park, Santa Ana Mts.
Orange County

Notes: Occasional to common. No flower.

Ron Vanderhoff   2021-01-28

Location: Santiago Canyon, from end of paved road to 2 air km SE, Santa Ana Mts.
Orange County

Notes: Isolated patch over ca. 90 sq. meters. Probably a remnant from old mining operations.

Ron Vanderhoff   2021-03-25

Location: Bell Cyn. Trail, 400m N of Starr Ridge Trail, Caspers Park
Orange County

Notes: Isolated patch over ca 20 sq. meters.

Ron Vanderhoff   2020-01-25

Location: Big Canyon area, Upper Newport Bay
Orange County

Notes: only about 15 vegetative plants found - and pulled in total. Among abundant emergent Melilotus, Brassica, others.

Ron Vanderhoff   2020-01-25

Location: Big Canyon area, Upper Newport Bay
Orange County

Notes: only about 15 vegetative plants found - and pulled in total. Among abundant emergent Melilotus, Brassica, others.

Ron Vanderhoff   2020-01-25

Location: Big Canyon area, Upper Newport Bay
Orange County

Notes: only about 15 vegetative plants found - and pulled in total. Among abundant emergent Melilotus, Brassica, others.

Ron Vanderhoff   2021-06-10

Location: San Juan Creek, 175m S confluence of Cold Springs Creek, Caspers Park, Santa Ana Mts.
Orange County

Notes: Single plant, probably not reproductive. About 1.7m to top of foliage.