OF ARTS AND SCIENCES. 271 



++ ++ Stouter, erect : bracts foliaceous : involucres and tiowers 2 to 2^ lines 

 long. 



11. C. VALiDA. Mostly stout, 6 inches high or less, sparingly 

 branched : leaves oblanceolate, an inch long, the bracts similar : in- 

 volucres in rather close heads, 2h to 3 lines long; teeth nearly equal, 

 slightly si)i'eading with straight awns, scarcely margined : flowers 2^ 

 lines long, villous or glabrous ; segments oblong, very unequal, the 

 shorter ones erose : stamens adnate to the middle of the tube or 

 nearly to the top. — Specimens in herb. Gray are from the '' Rus- 

 sian Colony " (from herb. Acad. St. Petersb.), and also collected by 

 Rev. Mr. Samuels, probably in the same region. 



12. C. Palmeri. Stout and branching, a span high or less: leaves 

 spatulate, 2 inches long : bracts oblanceolate, conspicuous : involucres 

 in large close cymes, 2 lines long ; teeth not margined, slightly diver- 

 gent, one long-awned, the rest nearly equal : flowers glabrous, broadly 

 lobed ; outer segments rounded, entire, the inner shorter, truncate or 

 bifid, shortly laciniate : stamens near the base. — Near San Luis 

 Obispo; Dr. Edward Palmer, 1876 (n. 464). 



» * Involucres at length scattered or only loosely cymosely clustered ; teeth 

 unequal, not margined. 



■t- Calyx-segments lanceolate, fimbriate : leaves all radical : bracts not folia- 

 ceous : villous-pubescent or glabrate. — S. California. 



13. C. FiMBRiATA, Nutt. Segments coarsely fringed below the 

 obtuse summit. 



14. C. LACiNiATA, Torr. Segments long-acuminate, copiously 

 fringed. 



■t- I- Calyx-segments short, oblong, entire. 

 ++ Bracts not foliaceous. 



15. C. STATICOIDES, Bentli. Erect, often a foot high, branching 

 above: leaves oblong, tomentose beneath: involucres 1^ to 3 lines 

 long, alternate teeth often much enlarged: flowers rose-colored, 2 to 2^ 

 lines long, glabrous ; segments oblong, the inner ones nearly a half 

 shorter. — Monterey to San Diego. 



16. C. PROCUMBENS, Nutt. Slender, procumbent, diffusely branched 

 from the base : leaves spatulate, not tomentose : involucres 1 to 1 ^ 

 lines long: flowers yellowish, 1;^ lines long, with equal narrowly oblong 

 segments. — San Diego. 



t-f -w- Bracts more or less foliaceous : flowers 1^ lines long: branched from the 

 base. 



17. C. Parryi. Small, villous-pubescent, leafy: leaves narrowly 



