COMPOSITAE. 279 



Eriophylliun pedunculatum Heller. Stems sexeral, erect, simple, 30-50 

 cm. high; leaves all entire or obscurely denticulate, oblong-lanceolate, 3-5 cm. 

 long, acute, densely white-tomentose beneath, green and sparsely tomentose 

 above; heads long-peduncled; involucre lanate, the bracts acuminate with 

 recurved tips; corollas glandular; akenes glabrous. Near Lake Waha, Heller. 



Eriophyllum lanatum (Pursh) Forbes. Perennial, erect or decumbent at 

 base, loosely white- woolly throughout; leaves spatulate or cuneate-obovate, 

 the lowermost and upper ones often entire, the others 3-7-lobed or parted; 

 heads long-peduncled; involucre lanate, 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 and variable. 



418. RIGIOPAPPUS. 



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

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

 in^'olucre of one or two rows of rather rigid herbaceous erect 

 subulate-linear bracts; receptacle flat, naked; pappus of 3-5 

 rigid opaque subulate awn-shaped scales ; akenes linear, slender, 

 compressed, those of the disk more or less 4-angled. 



Rigiopappus leptocladus Gray. 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 8-10 mm. high; flowers yellow or 

 purplish; akene linear, transversely rugose, hirsute, 5 mm. long; pappus of 

 3-5 rigid lanceolate scales nearly as long as the akenes. In sandy soil in the 

 lower valleys. 



419. GAILLARDIA. 



Pubescent herbs; leaves alternate, entire or incised or even 

 pinnatifid; heads solitary and long-peduncled, large; ray-flowers 

 yellow or partly dark-purple, sterile ; disk-flowers usually purplish 

 or brownish; involucral-bracts in 2-3 series, the outer larger 

 and foliaceous; receptacle convex or hemispherical, with one or 

 more awns among the flowers resembling chaff; pappus of 6-10 

 hyaline chaffy scales with a prominent midrib which is prolonged 

 into a naked awn, or in the sterile rays, scales awnless; akenes 

 oblong, top-shaped, each surrounded by a tuft of hairs. 



Gaillardia aristata Pursh. Perennial, erect, 30-60 cm. high, rough- 

 pubescent; lower leaves spatulate, long-petioled, the upper sessile, all entire 

 or more or less pinnately lobed, 5-12 cm. long; heads long-peduncled; in- 

 volucre hairy, the lanceolate acuminate bracts unequal, the longest about 1 

 cm.; disk-flowers dark-purple; rays 10-18, yellow, purplish at base, 15-20 mm. 

 long; bristles of the receptacle as long as the akenes or longer. Prairies, 

 common. 



420. HELENIUM. 



Erect, simple or branching herbs; leaves all alternate and all 

 but the lower sessile; heads small or large, many-flowered, on 

 naked terminal peduncles ; ray-flowers yellow, several or numer- 



