536 



COMPOSITE. 



Rays yellow, or yellow and white (herbage hispid, the stems brown- 

 spotted at the base of the bristles). 



Rays short (1 to 2 or 3 lines long) 5. B. hieracioide.s. 



Rays showy (5 lines long or more) and 



Yellow; pappus-bristles twice as long as the soft basal hairs 



6. B. gaillardioidcs. 

 White, yellow below the middle; pappus-bristles scarcely exceeding 

 the soft hairs 7. B. nemorosus. 



B. Pappus consisting of naked bristles. 



Bracts of involucre denticulate-ciliate on the margin at base; ravs yellow, 

 white-tipped 8. B. platyglo'ssus. 



C- Pappus, when present, consisting of flattened awns or paleae instead of 



bristles. 



Bracts of the involucre denticulate or ciliate on the basal margins where 

 folded around the achene. 

 Heads erect; rays yellow, white or whitish at summit. 



Achenes of both disk and ray glabrous; pappus none 



9. B. chrysanlhemoidts. 

 Achenes of disk pubescent or hairy; pappus present. 

 Leaves ciliate; pappus-paleae unequal. . , . . . 10. B. Douglasii. 

 Leaves not ciliate; pappus-palese about equal . 11. B. Fremonti. 

 Heads nodding in bud and fruit; rays yellow. . .12. B, nutans. 



1. B. hispid us Greene. Diffusely branched from the base, 1 ft. 

 high or less; herbage densely hispidulous throughout; leaves narrow, 

 all entire; heads small; rays white, inconspicuous; pappus bristles 10, 

 slender, bearing copious short interlaced hairs. 



Mt. Diablo and Kern Co., acc. to Greene. Possibly no more than 

 a variety of the next. 



2. B. gland ulosus Hook. Commonly branching from the base, 

 8 to 12 or 14 in. high; leaves and stems (particularly near the heads) 

 with scattered or abundant stipitate dark glands; leaves lanceolate or 

 linear, the lower pinnatifid or toothed, the upper entire; involucre 4^ 

 lines broad; rays 8 to 10, pure white, 6 or 7 lines long; pappus bright 

 white, the bristles 10 to 12, with straight hairs towards the base out- 

 side and woolly tangled hairs inside; achenes 1^ to 2\ lines long. — 

 (Layia* glandulosa H. & A.) 



Antioch; Southern California. Apr. 



Yar. heterotrichus (Layia heterotricha H. & A.). Often rough- 

 hispid; rays 10 to 18; inner woolly hairs of pappus wanting. — Sandy 

 fields: Lake Co. (acc. to Greene); San Joaquin Valley. 



3. B. elegans (Nutt.) Greene. Simple or diffuse, 8 to 11 in. high; 

 herbage short-hispid, the stems often brown-dotted; stipitate glands 

 small and scattered; leaves linear, the lower pinnately toothed or 

 parted; rays yellow, 6 to 8 lines long, sometimes white-edged; pappus 

 white, the villous hairs copious but much shorter than the awn-like 

 bristles. — (Layia elegans T. & G. ) 



Ukiah, acc. to Gray; mountain summits east of Calistoga; Southern 

 California. 



4. B. carnosus (T. & G.) Greene. Beach Layia. Five to 9 

 in. high, diffusely branched from the base, somewhat pubescent, 

 scarcely at all glandular; leaves succulent, spatulate to linear-oblong, 



