26 University of California Publications in Botany. [VOL. 3 



A. Pappus either none or paleaceous, never plumose. 



Achenes destitute of pappus 104. ATEICHOSEEIS, p. 246. 



Achenes with paleaceous pappus. 



Flowers blue; paleae truncate, destitute of awn.... 



103. CICHOEIUM, p. 246. 



Flowers yellow. 



Involucral bracts plane; paleae all awn-tipped 



105. MICEOSEEIS, p. 247. 



Involucral bracts concave, enfolding marginal achenes; alternate 



paleae of central achenes awn-tipped 



106. KHAGADIOLUS, p. 252. 



B. Pappus of plumose bristles. 



Keceptacle paleaceous or with soft slender bristles among the flowers: 



leaves all radical. 

 Involucral bracts with broad membranous margins, the outermost ones 



orbicular 107. ANISOCOMA, p. 253. 



Involucral bracts herbaceous, all narrow 108. HYPCHOEEIS, p. 254. 



Eeceptacle naked: leaves radical or cauline. 



Achenes truncate at apex, not beaked.. ..109. STEPHANOMEEIA, p. 255. 

 Achenes beaked. 



Leaves pinnatifid 110. EAFINESQUIA, p. 261. 



Leaves narrow, entire 111. TEAGOPOGON, p. 262. 



C. Pappus of capillary bristles, never plumose or paleaceous. 



Achenes not flattened. 



Plants caulescent, the more or less leafy stems branching above and 



bearing several to numerous heads. 



Pappus promptly deciduous (1 or 2 persistent bristles in some 

 species), some or all of the bristles united at base an|d falling 

 away in a ring. 



Achenes beakless, truncate: no tack-shaped glands - 



112. MALACOTHEIX, p. 262. 



Achenes beaked. 



Inflorescence with tack-shaped glands: achenes gradually nar- 

 rowed above 113. CALYCOSEEIS, p. 269. 



Inflorescence not glandular: achenes truncate, short-beaked 



114. GLYPTOPLEUEA, p. 271. 



Pappus tardily deciduous, the bristles falling separately, or persistent. 

 Achenes truncate at the broad summit. 



Flowers rose-colored: involucral bracts 4 or 5 



118. LYGODESMIA, p. 275. 



Flowers yellow or white: involucral bracts 10 or more 



121. HIEEACIUM, p. 283. 



Achenes narrowed to the summit 120. CEEPIS, p. 280. 



