52 NORTH AMERICAN FLORA [VOLUME 34 



linear divisions, permanently white-tomentose ; stem-leaves few and smaller; heads 1-5; 

 involucre about 6 mm. high and 1 cm. broad, densely tomentose; bracts obovate with pale- 

 yellow tips; corollas yellow; tube 1.5 mm. long; throat about 1.5 mm. long, longer than the 

 ovate lobes; achenes 4 mm. long, densely silky-hirsute; squamellae very short, hidden by the 

 hairs or often wanting. 



Type locality: Ham's Fork of the Colorado of the West, Wyoming. 

 Distribution: Wyoming. 



16. Hymenopappus eriopodus A. Nelson, Bot. Gaz. 37: 274. 1904. 



A leafy-stemmed perennial with a cespitose densely woolly caudex; stems 4-10 dm. high, 



striate and sparingly floccose; leaves 5-15 cm. long, bipinnatifid into filiform divisions, floccose 



when young, in age glabrate; heads 1-4, corymbose, with long slender peduncles; involucre 



rusty-tomentose, 7-8 mm. high, 10-12 mm. broad; bracts elliptic or obovate, with white 



or purple-tinged tips and margins; corollas yellowish; tube 2-2.5 mm. long; throat 



deeply campanulate, 3 mm. long, three times as long as the lobes ; achenes 5 mm. long, 



silky; squamellae oblong, fully 1 mm. long. 



Type locality: Diamond Valley, Utah. 

 Distribution: Utah and Nevada. 



17. Hymenopappus columbianus Rydberg, sp. nov. 



A leafy-stemmed perennial with a densely woolly caudex; stems3-5 dm. high, branched 



above, striate and floccose; leaves 7-15 cm. long, pinnatifid or bipinnatifid with spreading 



linear- filiform divisions nearly 1 mm. broad; heads 5-12, corymbose-paniculate; involucre 



white-tomentose, 7 mm. high, 10-12 mm. broad; bracts broadly obovate, with yellowish 



margins; corollas yellow; tube 2-2.5 mm. long; throat deeply campanulate, 2.5 mm. long, 



three times as long as the lobes; achenes 4 mm. long, villous; squamellae small, almost 



hidden by the hairs. 



Type collected near Moses Dake, Washington, July 4, 1893, Sandberg & Leiberg 375 (U. S. 

 Nat. Herb.). 



Distribution: Eastern Washington. 



18. Hymenopappus macroglottis Rydb. Bull. Torrey Club 27: 636. 



1900. 



A subscapose perennial with cespitose caudex; stems 3-4 dm. high, striate, more or less 



floccose; leaves mostly basal, about 1 dm. long, bipinnatifid with narrowly linear divisions; 



stem-leaves reduced, simply pinnate or entire; heads few, corymbose ; involucre 7-8 mm. high, 



12-15 mm. broad; bracts oblong or oblong-obovate, with yellow tips and margins; corollas 



yellow; tube about 2 mm. long; throat deeply campanulate, 3-4 mm. long, 3-4 times as long 



as the lobes; achenes about 5 mm. long, hirsute; squamellae of the pappus about 1 mm. long. 



Type locality: Oak Creek, Arizona. 

 Distribution: Colorado to Arizona. 



19. Hymenopappus niveus Rydberg, sp. nov. 



A leafy-stemmed perennial with cespitose caudex; stems densely white-tomentose, 3 dm. 

 high; leaves 5-10 cm. long, twice pinnatifid with short linear-filiform divisions, white-tomen- 

 tose; heads 3-7, corymbose on erect peduncles; involucre somewhat turbinate, 8 mm. high, 

 8-10 mm. broad, densely tomentose below; bracts obovate, tipped and bordered with yellow; 

 corollas yellow; tube about 2 mm. long; throat 2.5 mm. long, deeply campanulate, about 4 

 times as long as the ovate lobes; achenes densely silky, 4 mm. long; squamellae oblong, about 

 equaling the corolla-tube. 



Type collected at Springdale, Utah, May 14, 1894, M. E. Jones 5261 (herb. N. Y. Bot. Gard.). 

 Distribution: Utah and Nevada. 



20. Hymenopappus lugens Greene, Pittonia4: 43. 1899. 



A subscapose perennial with a cespitose woody caudex; stems 2-3 dm. high, floccose; 

 leaves tomentose, 5-10 cm. long, bipinnatifid with linear-filiform divisions; heads 1-4, on rather 



