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 Aegilops triuncialis Aegilops triuncialis
2007 Neal Kramer
2001 Joe DiTomaso
2017 Contractor MROSD

Cenchrus echinatus    Southern sandbur
invasive non-native
Annual grass

POACEAE

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

Cenchrus longispinus    Mat sandbur
invasive non-native
Annual grass

POACEAE

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

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

ASTERACEAE

Centaurea solstitialis Centaurea solstitialis Centaurea solstitialis
2004 Carol W. Witham
2008 Luigi Rignanese
2014 Robert F Norris

Chrysanthemoides monilifera   
non-native

ASTERACEAE

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

Delairea odorata    Cape ivy
invasive non-native
Perennial herb

ASTERACEAE

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

Dittrichia graveolens    Stinkwort
invasive non-native
Annual herb

ASTERACEAE

Dittrichia graveolens Dittrichia graveolens Dittrichia graveolens
2008 Keir Morse
2018 Aaron Echols
2014 Neal Kramer

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

POACEAE

Ehrharta calycina Ehrharta calycina Ehrharta calycina
2013 Dale Ritenour
2015 Zoya Akulova
2014 Neal Kramer

Ehrharta longiflora    Longflowered veldtgrass
invasive non-native
Annual grass

POACEAE

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

Galenia pubescens    Coastal galenia
non-native
Perennial herb

AIZOACEAE

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

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

HYPERICACEAE

Hypericum canariense Hypericum canariense Hypericum canariense
2007 Neal Kramer
2008 John Dittes
2011 Neal Kramer

Melinis repens    Natal grass
non-native
Annual grass

POACEAE

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

Parthenium hysterophorus    Santa maria feverfew
invasive non-native
Perennial herb

ASTERACEAE

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

Rhamnus alaternus    Italian buckthorn
invasive non-native
Shrub

RHAMNACEAE

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

Rubus armeniacus    Himalayan blackberry
invasive non-native
Shrub

ROSACEAE

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

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

ASTERACEAE

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

Senecio quadridentatus    Cotton burnweed
non-native
Annual, Perennial herb

ASTERACEAE

Senecio quadridentatus Senecio quadridentatus Senecio quadridentatus
2018 Ron Vanderhoff
2018 Ron Vanderhoff
2018 Ron Vanderhoff

Volutaria tubuliflora    Egyptian knapweed
invasive non-native
Annual herb

ASTERACEAE

Volutaria tubuliflora Volutaria tubuliflora Volutaria tubuliflora
2018 Mason Hyland
2018 Henry DiRocco
2015 Ron Vanderhoff