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OCCNPS 2022
Emergent Invasive Plants
in Orange County
Our science-based priority candidates for
Click on a plant for more information and images.
Plant Profiles for each species can be printed for field use.
Watch for these weeds as you visit OC’s wildlands.
Record your observations on Calflora and/or iNaturalist,
or report them to , following
This list is dynamic. All species are reviewed annually.
Emergent Invasive Plants are:
- New to the region
- Are small populations with a potential for eradication
- Pose significant environmental impacts
 Brassica fruticulosa
MEDITERRANEAN CABBAGE
 Centaurea benedicta
BLESSED THISTLE
 Hypericum canariense
CANARY ISLAND
ST. JOHN'S WORT
 Galenia pubescens
COASTAL GALENIA
 Chrysanthemoides monilifera
BONESEED
 Centaurea diluta
SPOTTED KNAPWEED
 Dipogon lignosus
OKIE BEAN
 Melinis repens
NATAL GRASS
 Euphorbia terracina
GERALTON CARNATION WEED
 Aegilops triuncialis
GOATGRASS
 Centaurea solstitialis
YELLOW STAR THISTLE
 Parthenium hysterophorus
SANTA MARIA FEVERFEW
 Volutaria tubuliflora
EGYPTIAN KNAPWEED
 Senecio linearifolius
LINEAR-LEAVED
AUSTRALIAN FIREWEED
 Senecio angustifolius
 Rubus armeniacus
HIMALAYAN BLACKBERRY
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