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



Involucral bracts obtuse: some pappus-bristles flattened .. 



Acamptopappus Shockleyi, p. 41. 



Heads not solitary (except one stage of Ericameria pinifolia) : 

 pappus dull white to reddish. 



Pappus-bristles not over 20, flattened 



5. AMPHIACHYEIS, p. 36. 



Pappus-bristles more numerous, slender. 



Involucre hemispheric: leaves spinulose-toothed .. 



Haplopappus junceus, p. 50. 



Involucre campanulate, tomentose: leaves entire or serrate ... 

 ....Hazardia cana, p. 65. 



Involucre narrower: leaves entire 14. EEICAMEEIA, p. 51. 



B. Rays present, not yellow. (C on p. 16.) 

 Pappus of the ray much reduced, scanty or wanting. 



Perennial: herbage tomentose, at least when young ... 



19. COEETHEOGYNE, p. 69. 



Annuals: herbage not tomentose. 



Leaves pinnatifid or incised: disk-pappus copious .. 



20. PSILACTIS, p. 73. 



Leaves entire: pappus-bristle solitary, plumose at tip ... 



21. MONOPTILON, p. 74. 



Pappus well developed in both ray and disk. 



Heads sessile, solitary: low desert annual with white or pinkish rays 



21. MONOPTILON, p. 74. 



Heads variously clustered, or solitary and evidently peduncled. 



Style-appendages lanceolate to subulate, acute: involucral bracts in 



two or more series, unequal 22. ASTEE, p. 76. 



Style-appendages ovate or oblong, obtuse : involucral bracts imbricated 



in several series, unequal (low perennial with leaves less than 



12 mm. long) 23. LEUCELENE, p. 86. 



Style-appendages triangular or oblong, obtuse: involucral bracts in 



one or two series, mostly equal 24. EEIGEEON, p. 87. 



C. Rays none. 



Stems suffrutescent, at least below (perennial shrubs or shrubby plants). 

 Flowers yellow, perfect. 



Pappus-bristles numerous, all slender. 



Bracts of the involucre without distinct green tips: leaves entire. 



lavolucre turbinate or broader: bracts not in distinct vertical 



ranks: herbage minutely if at all pubescent (usually 



resinous-punctate) 14. EEICAMEEIA, p. 51. 



Involucre narrower: bracts in more or less distinct vertical 

 ranks: herbage glabrous to tomentose (resinous-punctate 



only in first two species) 



15. CHEYSOTHAMNUS, p. 56. 



