( 462 ) 
Pappus of capillary bristles. 
Heads solitary, terminating naked peduncles. 5. Stenotopsis. 
Heads not terminating naked peduncles, seldom solitary. 
6. Ericameria. 
Rays none. 
Flowers perfect, yellow. 
Pappus white or yellowish. 
Pappus-bristles all slender. 
Involucral bracts not in distinct vertical ranks; herbage 
resinous-punctate. 6. Ericameria. 
Involucral bracts in distinct vertical ranks; only the first 
two species resinous-punctate. 7. Chrysothamnus. 
Pappus-bristles, at least some, with flattened tips. 
4. Acamptopappus. 
Pappus tawny; bracts well-imbricated, squamose. 
8. Hazardia. 
Flowers dioecious, whitish. 9. Baccharis. 
TRIBE 3. Inuleae. 
Willow-like shrub, with silvery appressed pubescence. 10. Pluchea. 
Trise 4. Heliantheae. 
Pappus of plumose-bristles, rays none. 11. 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 5. Anthemideae. 
Spinescent undershrub; achenes and flowers cobwebby. 14. Picrothamnus. 
Not spinescent; achenes and flowers not cobwebby. 15. Artemisia. 
TriBeE 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. 17. Peucephyllum. 
Heads radiate. 19. Senecio. 
Bracts of the involucre 4-6, broad and obtuse. 18. Tetradymia. 
1. HOFMEISTERIA. 
1. HoFMEIsTERIA PLURISETA A. Gray, Pacif. R. Rep. 4: 96, 
pl. 0. A857. 
Type locality: “In a canyon at Bill William’s fork, northern 
Arizona.” 
