( 462) 
Pappus of capillary bristles 
Heads solitary, dernnaeine naked peduncles. 5. ees 
Heads not terminating naked peduncles, seldom solit 
: Ge 
Rays none. 
Flowers an yellow 
Pa white or pallet 
ee us-bristles all ce 
ee saa not in distinct vertical sai herbage 
resinous-pu te. 6. Ericameria, 
Involve aes in distinct vertical ranks; cl the first 
cles resinous-punctate. ?. sothamnus, 
ae ane at least some, with Aaeehed tips. 
4. Acamptopappus. 
Pappus tawny; bracts well-imbricated, squamose 
. Hazardia. 
Flowers dioecious, whitish. g. Baccharis. 
TRIBE 3. Inuleae. 
Willow-like shrub, with silvery appressed pubescence. 10. Pluchea. 
Tripe 4. Heliantheae. 
Pappus of plumose-bristles, rays none. ii. Bebbia. 
Pappus of scales; rays present or none. 
Disk-achenes thick, 4- or 5-angled, not winged 12. Vigutera. 
Disk-achenes flattened, the acute angles ciliate or winged. 
13. Encelia. 
TRIBE §. Anthemideae. 
Spinescent undershrub; achenes and flowers cobwebbry. 
14. Picrothamnus. 
Not spinescent; achenes and flowers not cobwebby. 
15. .drtemisia. 
Trise 6. Senecioneae. 
Involucral bracts in 3 or 4 series, imbricated; leaves scale-like. 
16. Lepidospartum. 
Involucral bracts in I or 2 series 
Bracts of the involucre many, linear to subulate. 
Heads discoid. 
Heads radiate 
17. os 
Bracts of the involucre 4-6, broad and obtuse. 
19. Senec 
18. Torna mia. 
1. HOFMEISTERIA. 
1. HorMEISTERIA PLURISETA A. Gray, Pacif. R. Rep. 4: 96 
pl. 9. 1857. 
Type scaly: “In a canyon at Bill William’s fork, northern 
Arizona.” 
