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



Herbage not gummy: pappus-paleae 5 or fewer, subulate- 



awned 72. EIGIOPAPPUS, p. 187. 



Flowers not yellow. 



Herbage rough-pubescent: pappus of 4 to 8 paleae 



69. PALAFOXIA, p. 179. 



Herbage glabrous: pappus of copious capillary bristles 



81. POROPHYLLUM, p. 209. 



Leaves from dentate to pinnatifid or pinnately parted. 



Herbage glabrous but dotted with oil-glands 



80. DYSODIA, p. 208. 



Herbage pubescent (mostly tomentose), at least when young: 

 no oil-glands. 



Involucral bracts with colored hyaline margins 



68. HYMENOPAPPUS, p. 177. 



Involucral bracts herbaceous. 



Pappus of several paleae (fimbriate in one species). 



Stems 5 cm. or less high: involucre 3 mm. high 



Eriophyllum Pringlei, p. 181. 



Stems taller: involucre larger 



73. CHAENACTIS, p. 188. 



Pappus apparently of slender tawny bristles: low desert 

 annual 75. TRICHOPTILIUM, p. 202. 



Heads radiate. 



Eays white or purplish, never yellow. 



Pappus an obscure crown and often 1 or 2 awns: rays white 



63. PERITYLE, p. 164. 



Pappus of both bristles and awned paleae: rays purple or flesh- 

 color 79. NICOLLETIA, p. 207. 



Pappus of lacerate paleae: rays purple, linear 



Hulsea heterochroma, p. 202. 



Kays yellow: pappus paleaceous except in no. 67. 

 Herbage white-woolly, at least when young. 



Pappus of numerous barbellulate bristles, united at base 



67. SYNTEICHOPAPPUS, p. 176. 



Pappus paleaceous, the paleae entire to fimbriate. 



Kays persistent, becoming papery: desert perennial 



61. PSILOSTROPHE, p. 162. 



Rays deciduous, not becoming papery. 



Involucral bracts in 1 series 



70. ERIOPHYLLUM, p. 180. 



Involucral bracts in 2 series 74 HULSEA, p. 200. 



Herbage glabrous or pubescent but never woolly. 



Involucral bracts erect, in 2 series.. ..76. HYMENOXYS, p. 203. 

 Involucral bracts closely reflexed 77. HELENIUM, p. 205. 



