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. Tofr. 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 

 campanula te 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- 

 pressed, 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, 8-15 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 e volute 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, 



