194 Flora of the Palouse Region 



L. ramosissima Nutt. Erect, loosely branched, 15-70 cm. high: stems 

 light colored, puberulent: leaves all but the lowest attenuate, entire, linear- 

 lanceolate or the lowest somewhat spatulate, 1-3 cm. long, all white villous: 

 heads 5-6 mm. long, in small clusters on the leafy branches: involucral- 

 bracts ciliate with long hairs, and usually with a few stalked glands on the 

 back: rays yellow, small: akenes 3 mm. long, club-shaped with a ridge 

 down the inner face. Dry ground common. 



323. BLEPHARIPAPPUS. 



Annuals: heads rather few-flowered: ray-flowers 3-6, short 

 and broad, pistillate; disk-flowers 7-12, perfect, some of the cen- 

 tral sterile: involucral-bracts 6-10, nearly in one row: receptacle 

 convex, chaffy: pappus of 10 or 12 linear hyaline scales, each with 

 a stout awn-like midrib, rarely wanting: ray-akenes neither ob- 

 compressed nor laterally compressed. 



B. SCaber Hook. Annual, erect, branched above, 10-20 cm. high, scab- 

 rous-puberulent below, glabrous above: leaves numerous, attenuate, linear, 

 somewhat involute, 1-2 cm. long: heads few, somewhat corymbed, terminat- 

 ing leafy branches: involucre 5-6 mm. high: ray and disk flowers white: 

 anthers purple. Bluffs of Snake River opposite Lewiston. 



324. ERIOPHYLLUM. 



Perennial herbs, sometimes shrubby at base: leaves usually alter- 

 nate and mostly pinuately or ternately parted or lobed: ray-flow- 

 ers present, fertile: involucre campanulate or obovoid; bracts erect, 

 commonly united at base, oval or oblong: pappus of nerve- 

 less and mostly pointless scales: throat or limb of disk-corollas 

 rather narrow: style-branches truncate or rarely minutely tipped: 

 akenes narrow, mostly 4-angled. 



E. caespitosum Dougl. Perennial, erect or decumbent at base, loosely 

 white-woolly throughout: leaves spatulate or cuneate-obovate, the lower- 

 most and upper ones often entire, the others 3-7-lobed or parted: heads long- 

 peduncled: involucre campanulate, 10-12 mm. high; bracts 8-12, oblong, 

 obtuse: rays 6-15, golden-yellow: disk-corollas glandular: akenes glabrous: 

 pappus short. In gravelly soil, common. 



325. RIGIOPAPPUS. 



Annuals: leaves alternate, linear, entire: heads rather many- 

 flowered; ray-flowers 5-12, pistillate; all the flowers fertile: invol- 

 ucre of one or two rows of rather rigid herbaceous erect subulate- 

 linear bracts: receptacle flat, naked: pappus of 4-5 rigid opaque 

 subulate awn-shaped scales: akenes linear, slender, compressed, 

 those of the disk more or less 4-angled. 



R. leptOCla&US Gray. Annual, erect, slender, minutely pubescent, 10-30 

 cm. high, simple or usually with slender branches that are leafless below: 

 leaves alternate, linear, acute, erect, 1-3 cm. long, or those near the tips of 

 the slender branches much smaller: heads S-10 mm. high: flowers yellow or 



