MADIACEJE. 201 



rays pale yellow below the middle, white above it: pappus short, the bristles 

 often scarcely surpassing- their copious brownish villous hairs. A 

 beautiful species of shaded slopes on Tamalpais, Mt. Diablo, and the 

 Berkeley Hills. May, June. 



*-*- Villous hairs of pappus-bristles more or less interlaced. 



7. B. hispidus, Greene. Scarcely 1 ft. high, branching from the 

 base, rather densely hispidulous; a few dark stipitate glands on the 

 involucre: leaves all narrow, entire: rays white, rather short and not 

 conspicuous: pappus white, of 10 aristiform bristles, with copious short- 

 villous hairs, the innermosb of which are interlaced. Mt. Diablo and 

 southward, near the higher summits. May, June. 



8. B. elegans (Nutt), Greene. Habit of the last but much larger, 

 more or less stipitate-glandular throughout: lower leaves pinnately 

 toothed; upper entire: rays yellow, % in. long: pappus white, its copious 

 villous hairs much shorter than the aristiform bristles. More widely 

 diffused than the last, and at lower elevations. May, June. 



* * Pappus of naked aristiform bristles. 



9. B. platyglossus (F. & M.), Greene. Sparingly branching, 1 ft. 

 high more or less, hirsute and stipitate-glandular: lower leaves pinnat- 

 ifid into linear lobes: rays % in. long, yellow, with white tips: pappus of 

 1520 upwardly scabrous stout awn-like bristles. Common in open 

 grounds. April June. 



** * Pappus paleaceous or none. 



10. B. Fremonti (T. &G), Greene. Strictly erect; branching above 

 the base, 1 ft. high, minutely pubescent, not glandular: leaves pinnately 

 cut into short lobes: rays % % in- long, yellow at base, white above it: 

 pappus-palest ovate to oblong -lanceolate, tapering into a subulate awn, 

 entire at the margins and with a few long-villous hairs. Plains of the 

 lower Sacramento, etc. April, May. 



11. B. Douglasii (H. & A.), Greene. Habit and flowers of the last, 

 but plant nearly or quite glabrous : pappus of 1018 very unequal rigid 

 subulate awns, these slightly hirsute near the dilated base, Var. oligo- 

 choeta (Gray). Pappus reduced to 2 marginal awns and some rudiments 

 of intervening ones. About the Bay and northward. April June. 



12. B. chrysanthemoides (DC.), Greene. Aspect of the preceding; 

 flowers the same: achenes destitute of pappus and all wholly gla- 

 brous. Habitat of the last. April June. 



13. B, nutaiis, Greene. Low, slender, with divergent branches above 

 the base, 3 6 in. high: leaves all linear, entire, the lower pairs opposite, 



