Part 1, 1914] CARDUACEAK : HELENIEAE 51 



corollas light-yellow; tube about 1.5 mm. long; throat fully 1 mm. long; lobes ovate, somewhat 



shorter; anthers only partly exsertcd; achenes 3 mm. long, strongly striate, villous-hirsute 



on the angles; squamcllac obovate, fully 1 mm. long. 



Type locality: "Upper Louisiana" [probably South Dakota]. 

 Distribution: North Dakota to Kansas, northern New Mexico, and Wyoming. 

 Illustrations: Britt. & Brown, 111. Fl. /. 3962; ed. 2./. 4531; Clements, Rocky Mt. Fl. pi. 41. 

 f.4. 



11. Hymenopappus tomentosus Rydb. Bull. Torrey Club 



27: 633. 1900. 



A leafy-stemmed biennial or perennial; stem densely and permanently white-tomentose, 



3-4 dm. high; leaves .5-7 cm. long, bipinnatifid into linear divisions 4-10 mm. long, about 1 



mm. wide; heads several, corymbose; involucre 5 mm. high, 8 mm. broad, densely woolly; 



bracts elHptic-obovate, with yellow tips; corollas yellow; tube fully 1 mm. long; throat 



campanulate, about as long as the tube, a little longer than the ovate lobes; achenes 3 mm. 



long, silky-strigose; squamellae obovate, a little shorter than the corolla-tube. 



Type locality: St. George, Utah. 



Distribution: Known only from the type locality. 



12. Hymenopappus cinereus Rydb. Bull. Torrey Club 27: 634. 



1900. 



Hymenopappus ochroleucus Greene, PI. Baker. 3: 30. 1901. 



A low perennial with cespitose caudex; stems 2-3 dm. high, few-leaved, grayish-fioccose; 

 leaves mostly basal, bipinnatifid into narrowly linear divisions, grayish-fioccose; heads few, 

 corymbose; involucre 6 mm. high, 10-12 mm. broad, tomentose; bracts oblong-obovate, 

 with yellowish tip and margins; corollas yellow; tube and throat each about 1.5 mm. long, the 

 latter campanulate, twice as long as the ovate lobes; achenes 4 mm. long, loosely villous- 

 hirsute; squamellae obovate, nearly or fully 1 mm. long, not hidden by the hairs. 



Type locality: Walsenburg, Colorado. 

 Distribution: Colorado and Utah. 



13. Hymenopappus arenosus A. Heller, Bull. Torrey Club 

 25: 200. 1898. 

 A low perennial, cespitose at the base; stems 2-3 dm. high, densely white-floccose-tomen- 

 tose, especially below; leaves 5-10 cm. long, mostly basal, twice or thrice pinnatifid into nar- 

 rowly linear divisions; heads few, corymbose; involucre about 6 mm. high and 1 cm. broad; 

 bracts obovate, with white or light-yellow tips, and floccose at the base; corollas yellow; 

 tube about 2 mm. long; throat cylindro-campanulate, twice or thrice as long as the lobes; 

 achenes silky villous, 3 mm. long; squamellae oblong, fully 1 mm. long. 



Type locality: Espanola, New Mexico. 

 Distribution: New Mexico, Colorado, and Arizona. 



14. Hymenopappus filifolius Hook. Fl. Bor. Am. 1: 317. 1833. 



Hymenopappus tenuifoUus Dougl.; Hook. Fl. Bor. Am. 1: 317, as synonym. 1833. 



A leafy-stemmed perennial; stem 3-5 dm. high, floccose, densely leafy towards the base, 

 lower leaves 7-15 cm. long, twice pinnatifid into nearly filiform divisions, sparingly floccose, 

 "in age glabrate; heads comparatively few; involucre 5-6 mm. high, 8-10 mm. broad, tomen- 

 tose; bracts obovate, with yellow tips; corollas yellow; tube a little over 1.5-2 mm. long; 

 throat campanulate, about 1.5 mm. long, longer than the ovate lobes; achenes 4 mm. long, 

 densely silky-hirsute all over; squamellae very short, hidden by the hairs. 



Type locality: Arid ground of the Columbia near the Walla-Walla. 



Distribution: Saskatchewan to Washington, Nevada, New Mexico, and Kansas. 



Illustrations: Britt. & Brown, 111. Fl. /. 3964; ed. 2. /. 4533. 



15. Hymenopappus luteus Nutt. Trans. Am. Phil. Soc. II. 7: 374. 



1841. 

 A low subscapose perennial with a branched caudex; stems 1-2 dm. high, densely woolly 

 at the base; leaves mostly basal, 5-10 cm. long, twice pinnatifid with short oblong or 



