270 PROCEEDINGS OF THE AMERICAN ACADEMY 



§ 2. Villous-pubescent or hirsute, not glandular, fragile : bracts 1 to 3, distinct, 

 at least the uppermost acicular-subulate : involucres more or less clustered 

 or capitate, coriaceous, 1-flowered, 6-angled and tootlied, the divergent teeth 

 often uncinate : flowers mostly 6-cleft, nearly sessile, glabrous or bristly- 

 villous on the midveins (pubescent in n. 5) : stamens mostly 9, inserted 

 below the middle. — Euchorizanthe, Torr. & Gray. 



* Involucres subcapitate ; margins of the teeth mostly scarious : stems more or 

 less leafy and bracts foliaceous. 



■1- Teeth united by a petaloid margin (except in the alar involucres) : stems 

 erect : heads few and dense. 



5. C. MEMBRANACEA, Beuth. Floccose-tomentose, slender, leafy : 

 leaves linear : scarious limb of the involucre at length broadly dilated : 

 flowers as in the preceding section ; the sepals spatulate : stamens at 

 the base. — Mendocino County to San Luis Obispo. 



6. C. STELLULATA, Beiith. Low, hirsute : leaves liuear-oblanceo- 

 late, scattered : involucres 2 or 3 lines long ; margin of the teeth 

 narrower : flowers glabrous, sessile, 2^ lines long, equally 6-cleft ; 

 segments obcordate. — Sacramento Valley ; only from Hartvveg. 



7. C. DouGLASii, Benth. Similar, but leaves in 1 or 2 whorls: 

 involucres 1^ lines long: flowers shortly pedicelled, a line long; seg- 

 ments truncate, the outer cuspidate, the inner shorter and retuse. — 

 Near Monterey (?) ; only from Douglas. 



H- -1- Teeth distinct, scariously margined or herbaceous : usually more diffuse 

 and decumbent, villous-pubescent, with more numerous scattered heads. 

 •w- Slender and mostly decumbent : involucres and flowers 1 to 1^ lines long. 



8. C. DIFFUSA, Benth. Leaves narrowly spatulate, an inch long or 

 less : bracts short, acerose : involucres and flowers a line long, the 

 teeth long-awned and broadly scarious : calyx-segments oblong, nearly 

 equal, the inner slightly narrower. — Near Monterey. 



9. C. Breweri. Ascending or erect, 2 to 4 inches high, softly 

 pubescent : leaves ovate or rounded, 3 to 6 lines broad, on slender 

 petioles : bracts foliaceous, linear-oblanceolate, pungent : involucres 

 and flowers 1^ lines long, the short slightly unequal teeth united at 

 base by an inconspicuous margin, stout and curved, shortly awned : 

 flowers glabrous or villous ; segments broadly oblong, the inner ones 

 shorter : stamens at the base. — On dry rocky hillsides at San Luis 

 Obispo and in San Margarita Valley ; collected by Prof. W. H. 

 Brewer. 



10. C. PUNGENS, Benth. Decumbent or at first erect: leaves 

 oblanceolate, mostly opposite: bracts foliaceous: involucres 1^ to 2 

 lines long, the unequal teeth usually margined : calyx-segments short, 

 equal, oblong. — San Francisco and southward, common. 



