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1. C. Awericanus Gray. Involucre ovoid; 
bracts appressed, imbricate, with loose, sca- 
rious tips; flowers ochroleucous.—©©. Ma- 
rin County. Summer. 
2. C. EDULIS Gray. Bracts of the involucre 
not appressed, not rigid, but loose, tapering 
from a narrow base gradually into a short flac- 
cid spine; corolla lobes filiform, with a thick- 
ened tip; flowers purple or whitish—Oo. 
Common. Summer. 
3. C.Hatum Gray. Bractsof the involucre 
not appressed, not. rigid, but loose, tapering 
from a narrow base gradually into a flaccid, 
short spine; corolla lobes linear, flat; flowers 
rose-color or whitish.—©@©. Marin County, 
Summer. 
4. C. OCCIDENTALIS Gray. Bracts of the in- 
volucre with short coriaceous base and squar- 
rose, subulate tips; heads solitary, terminal, 
very large; flowers crimson. Common. Sum- 
mer. 
5. OC. FONTINALIS Greene. Bracts of the in- 
volucre herbaceous, broad, reflexed, with a 
short spinose tip; heads nodding; flowers 
whitish.—Crystal Springs; very local. Sum- 
mer. 
6. CO. QUERCETORUM Gray. Bracts of the in- 
volucre appressed, coriaceous, only the outer 
mucronate, the inner unarmed; all plane without 
