536 COMPOSITiE. 



Rays yellow, ov 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, hieracioides. 



Rays showy (5 lines long or more) and 

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



6. B. gaillardioides. 

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

 the soft hairs. . . '. . , . . 1. B. nemorosus. 



B. Pappus consisting of naked bristles. 

 Brncts of involucre denticulate-ciliate on the margin at base ; rays yellow, 

 white-tipped . ... . .8.B. platyglossus. 



C. Pappus, when present, consisting of flattened awns or pales 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. chrysanihemoides. 

 .■Vchenes of disk pubescent or hairy ; pappus present. 



Leaves ciliate; pappus-palese unequal 10. if. 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. 



ilt. Diablo and Kern Co., ace. to Greene. Possibly no more than 

 a variety of the next. 



2. B. glandulosus Hook. Commonly branching from the base, 

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

 with scattei'ed or abundant stipitate dark glands; leaves lanceolate or 

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

 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 IJ to 2J lines long. — 

 (Layia glandulosa H. & A.) 



Antioch; Southern California. Apr. 



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

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

 fields: Lake Co. (ace. 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, ace. to Gray; mountain summits east of Calistoga; Southern 

 California. 



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

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

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



