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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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