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Taxon  Report  
Streptanthus oblanceolatus  T.W. Nelson & J.P. Nelson
Trinity river jewel-flower
Streptanthus oblanceolatus is a perennial herb that is native to California.
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
~14 records in California
yellowone or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Genus: Streptanthus
Family: Brassicaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Name Status:
Accepted by JEF + CNPS + PLANTS

Information about  Streptanthus oblanceolatus from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora


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[efloras.org] Description, Range: Biennials; (glaucous), glabrous throughout. Stems: (base woody), virgately branched distally, 5-10 dm. Basal leaves rosulate; petiolate; blade oblanceolate, 3.5-7 cm, margins coarsely dentate distally. Cauline leaves: blade linear-lanceolate, 2-10 cm, (much smaller distally), base auriculate, margins entire. Racemes bracteate below or between proximalmost 1 or 2 flowers, (lax). Fruiting pedicels ascending, 3-6 mm, (strongly expanded at receptacle). Flowers: calyx shape unknown; sepals yellow, 8-9 mm, slightly keeled, (apex acuminate, recurved); petals yellowish, 12-16 mm, blade 4-5 0.5-1 mm, (adaxial pair slightly longer), margins not crisped, claw 7-9 mm, wider than blade, (apex recurved); stamens in 3 unequal pairs; filaments: abaxial pair (distinct), 9-11 mm, lateral pair 7-9 mm, adaxial pair (connate distal to middle of their length), 13-16 mm; anthers: abaxial and lateral pairs fertile, 3-3.5 mm, adaxial pair sterile, ca. 1 mm. Fruits divaricate ascending, torulose, flattened, 4-8 cm 1.5-2 mm; replum straight; ovules per ovary unknown; style to 1 mm; stigma entire. Seeds oblong, ca. 2 1 mm; wing distal. Flowering Jun-Jul. Cliffs and canyon walls in conifer forests; of conservation concern; ca. 400 m; Calif. Streptanthus oblanceolatus is known from Box Canyon, Trinity River, Trinity County. (contributed by Mary Ann Machi)

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/19/2024).