Weed
yellowspine thistle
AcheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.
OvalOval:
Broadly elliptic.
to oblanceolate, curved
Brown
Ribs that are longitudinal and irregular.
Scar is small and deep.
PappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
crown is strong and deep. StylarStylar:
The end of the fruit or seed that contains the style or the apical end.
knob is long.
State Noxious Weed: California
Not included
Asteraceae
Cirsium ochrocentrum A. Gray
