Carduus pycnocephalus  L.

Ubiquity:  Very common

Distritution: Throughout

Plant Communities: Many, including Ruderal

Habitats: Dry, sunny or shaded, grassy slopes/streamsides/riverbeds/riverbanks/waste areas; & disturbed places like fields/pastures/roadsides/trails/campsites; in most geologic formations including serpentine

Elevations: 10-2500'

Comments: Non-native. Noxious, invasive weed

Updated:  2/25/98