COMPOSITAE (COMPOSITE FAMILY) 555 



fourth the length of the throat: achenes villous with rather long hairs; scales 

 of the pappus oblong, a little longer than the corolla-tube. (H. cinereus Rydb 

 Bull. Torr. Bot. Club 27: 634. 1900; H. ochroleucus Greene, PL Baker. 3: 30. 

 1901.) Colorado and New Mexico. 



5. Hymenopappus scaposus Rydb. 1. c. An almost scapose perennial with 

 a caespitose caudex; stem with 1-2 reduced leaves: basal leaves 5-7 cm. long, 

 bipinnately divided into linear segments, 3-15 mm. long, more or less densely 

 tomentose, especially at the base: heads few, corymbose, hemispherical, about 

 1 cm. high and broad; bracts obovate, with yellowish or purplish-scarious 

 margins: corollas yellow; tube and throat each nearly 2 mm. long; the latter 

 campanulate and longer than the lobes: achenes densely silky; scales of the 

 pappus fully 2 mm. long, longer than the tube of the corolla. (H. parvulus 

 Greene, 1. c.) Colorado to New Mexico and Nevada. 



64. LEUCAMPYX Gray 



Perennial herb with the aspect of Hymenopappus. Heads heterogamous, 

 radiate; those of the disk perfect; both fertile. Involucre broadly hemispheri- 

 cal; bracts in 2-3 series, imbricated, broadly scarious at the apex. Recepta- 

 cle somewhat convex, covered with broad membranaceous-hyaline chaffy 

 scales half inclosing the achenes. Branches of the style in the perfect flowers 

 with short penicillate appendages. Achenes cuneate, incurved, dorsally com- 

 press^!, subtriquetrous, attenuate at base, obtuse at apex. Pappus none. 



1. Leucampyx Newberryi Gray, Porter & Coulter, Fl. Col. 77. 1874. 

 Herbaceous, at first woolly, at length nearly glabrous; stems stout, 3-6 dm. 

 high, corymbosely branched: leaves 2-3 pinnately parted, segments short, 

 linear, revolute on the margins; the radical ones lanceolate in outline, 8 r 15 cm. 

 long including the petioles: heads many, rather large, long-peduncled ; bracts 

 of the involucre obovate, obtuse, with broad scarious tips: corolla of the disk 

 yellow, of the ray white or cream-colored with a spreading cuneate limb 10-12 

 mm. long: achenes glabrous, angled, black. In canons; Colorado and New 

 Mexico. 



65. POLYPTERIS Nutt. 



Herbs more or less scabrous-pubescent, with undivided and mostly entire 

 petiolate leaves, all or the upper alternate and loosely cymose or paniculate 

 and pedunculate heads of rose-purple flowers. Involucre broadly campanu- 

 late to turbinate; the bracts spatulate to linear-lanceolate, commonly in 2 

 series and equal. Rays in our species evolute into a palmate, 3-cleft ligule, 

 fertile; corolla of the disk-flowers with long lobes; stamens wholly exserted. 

 Achenes from linear and downwardly attenuate to clavate-obpyramidal, 

 4-sided, minutely pubescent. Pappus of 6-12 equal hyaline scarious scales. 



1. Polypteris Hookeriana Gray, Proc. Am. Acad. 19: 30. 1883. Stout, 

 2-6 dm. high, above glandular-pubescent and somewhat viscid: leaves nar- 

 rowly to broadly lanceolate: involucre many-flowered, broad, 10-14 mm. 

 high, of 12-16 lanceolate bracts in 2 series, the outer looser and often wholly 

 herbaceous, inner with purplish tips: ray-flowers 8-10, the rose-red rays 

 10-12 mm. long, but sometimes reduced or abortive: pappus of the disk of 

 thin scales attenuate at apex into a slender point or short awn, nearly the 

 length of the achene. -Sandy plains; from Nebraska to Texas, and extending 

 within the eastern limits of our range. 



66. ERIOPHYLLUM Lag. 



Mostly floccose-woolly herbs, with alternate or partly opposite leaves, and 

 peduncled heads of golden-yellow flowers; in ours the heads are solitary or 

 scattered. Involucre of 1 or sometimes 2 series of oblong, permanently erect 

 bracts, either distinct or sometimes partially united into a cup, at least 

 in fruit concave at center, partially receiving the achenes. Receptacle from 

 convex or rarely conical to plane. Ray-flowers usually with broad ligules, 



