logo Calflora Illustrated Plant List 

OC CNPS Emergent Invasives

Used by the Orange County Chapter of CNPS to monitor a dynamic list of Emergent Invasive Plants within Orange County. As defined by OC CNPS, these are non-native plants that are recently arrived in OC or with very few populations and are believed to pose a significant threat to our natural areas. More information can be found at www.occnps.org, under Invasive Plants.
18 PLANTS
Aegilops triuncialis    Barbed goatgrass
invasive non-native
Annual grass

POACEAE

Aegilops triuncialis
2019 Jim Xerogeanes
Aegilops triuncialis
2001 Joe DiTomaso
Aegilops triuncialis
2019 Paul Aigner

Cenchrus echinatus    Southern sandbur
invasive non-native
Annual grass

POACEAE

Cenchrus echinatus
2017 Ron Vanderhoff
Cenchrus echinatus
2015 Ron Vanderhoff
Cenchrus echinatus
2012 Zoya Akulova

Cenchrus longispinus    Mat sandbur
invasive non-native
Annual grass

POACEAE

Cenchrus longispinus
2018 James Bailey
Cenchrus longispinus
2017 Ron Vanderhoff
Cenchrus longispinus
2013 Trent M. Draper

Centaurea solstitialis    Barnaby's thistle,  Yellow star thistle
invasive non-native
Annual herb

ASTERACEAE

Centaurea solstitialis
2004 Carol W. Witham
Centaurea solstitialis
2019 Arlee Montalvo
Centaurea solstitialis
2008 Luigi Rignanese

non-native

ASTERACEAE

Chrysanthemoides monilifera
2013 Ron Vanderhoff
Chrysanthemoides monilifera
2013 Ron Vanderhoff
Chrysanthemoides monilifera
2013 Ron Vanderhoff

Delairea odorata    Cape ivy
invasive non-native
Perennial herb

ASTERACEAE

Delairea odorata
2019 Ron Vanderhoff
Delairea odorata
2019 Ron Vanderhoff
Delairea odorata
2019 Ron Vanderhoff

Dittrichia graveolens    Stinkwort
invasive non-native
Annual herb

ASTERACEAE

Dittrichia graveolens
2008 Keir Morse
Dittrichia graveolens
2019 Andy Jones
Dittrichia graveolens
2017 Ron Vanderhoff

Ehrharta calycina    Perennial veldt grass,  Perennial veldtgrass
invasive non-native
Perennial grass

POACEAE

Ehrharta calycina
2013 Dale Ritenour
Ehrharta calycina
2019 Ron Vanderhoff
Ehrharta calycina
2014 Neal Kramer

Ehrharta longiflora    Longflowered veldtgrass
invasive non-native
Annual grass

POACEAE

Ehrharta longiflora
2015 Keir Morse
Ehrharta longiflora
2015 Keir Morse
Ehrharta longiflora
2015 Keir Morse

Galenia pubescens    Coastal galenia
non-native
Perennial herb

AIZOACEAE

Galenia pubescens
2017 James Bailey
Galenia pubescens
2018 Ron Vanderhoff
Galenia pubescens
2018 Ron Vanderhoff

Hypericum canariense    Canary island st. johnswort
invasive non-native
Shrub

HYPERICACEAE

Hypericum canariense
2019 Patrick Furtado
Hypericum canariense
2019 Patrick Furtado
Hypericum canariense
2015 Leah Bedoian

Melinis repens    Natal grass
non-native
Annual grass

POACEAE

Melinis repens
2016 Erik Larsen
Melinis repens
2017 Ron Vanderhoff
Melinis repens
2007 Zoya Akulova

Parthenium hysterophorus    Santa maria feverfew
invasive non-native
Perennial herb

ASTERACEAE

Parthenium hysterophorus
© 2015 Richard Spellenberg
Parthenium hysterophorus
2015 Richard Spellenberg
Parthenium hysterophorus
2016 Ron Vanderhoff

Rhamnus alaternus    Italian buckthorn
invasive non-native
Shrub

RHAMNACEAE

Rhamnus alaternus
2015 Ron Vanderhoff
Rhamnus alaternus
2015 Ron Vanderhoff
Rhamnus alaternus
2011 Eric Wrubel

Rubus armeniacus    Himalayan blackberry
invasive non-native
Shrub

ROSACEAE

Rubus armeniacus
2002 George W. Hartwell
Rubus armeniacus
2008 Keir Morse
Rubus armeniacus
2018 Richard Spjut

Senecio linearifolius var. linearifolius    Linear-leaved australian fireweed
non-native
Annual, Perennial herb

ASTERACEAE

Senecio linearifolius var. linearifolius
2019 Ron Vanderhoff
Senecio linearifolius var. linearifolius
2015 Ron Vanderhoff
Senecio linearifolius var. linearifolius
2018 Ron Vanderhoff

Senecio quadridentatus    Cotton burnweed
non-native
Annual, Perennial herb

ASTERACEAE

Senecio quadridentatus
2019 Adonis Tate
Senecio quadridentatus
2019 Adonis (Don) Tate
Senecio quadridentatus
2019 Adonis (Don) T

Volutaria tubuliflora    Egyptian knapweed
invasive non-native
Annual herb

ASTERACEAE

Volutaria tubuliflora
2015 Ron Vanderhoff
Volutaria tubuliflora
2015 Ron Vanderhoff
Volutaria tubuliflora
2016 Barbara Boethling