944 CARDUACEAE 



campanulate, about 3 times as long as the lobes; pappus-scales linear-oblong, 

 about half as long as the corolla-tube. Rocky places: Utah Nev. Son. My. 

 11 H. macroglottis Rydb. Perennial; stems several, 3-4 dm. high; leaves 

 mostly basal, about 1 dm. long, bipinnately divided into linear lobes 8-25 mm. 

 long; stem-leaves simply pinnate or simple; heads few, 12 mm. high and 12-15 

 mm. broad; bracts oblong, with very narrow yellowish scarious margins; corolla 

 yellow; throat deeply campanulate, 3-4 mm. long, 3-4 times as long as the lobes; 

 squamellae of the pappus about 1 mm. long. Dry hills: Tex. Colo. Utah 

 Ariz. Son. Au-S. 



97. LEUCAMPYX A. Gray. WILD COSMOS. 



More or less floccose perennials. Leaves alternate, bi- or tripinnatifid into 

 linear divisions. Heads corymbose, radiate. Involucres hemispheric; bracts 

 subequal, in 2-3 series, with scarious colored tips and margins; receptacle convex, 

 with broad membranous paleae, half enclosing the achenes. Ray-flowers pis- 

 tillate and fertile; ligules broad, 3-toothed, white or cream-colored. Disk- 

 flowers fertile; corollas yellow. Style branches penicillate, with short append- 

 ages. Achenes of the ray-flowers cuneate, 3-angled, those of the disk-flowers 

 5-angled, all more or less curved, striate and muriculate. Pappus a minute 

 crown. 



1. L. Newberryi A. Gray. Stem stout, 3-6 dm. high; involucres about 8 

 mm. high, 10-15 mm. wide; bracts obovate, obtuse; ligules 10-15 mm. long. 

 Canons: Colo. N.M. Submont. Mont. Je-Au. 



w 



98. OTHAKE Raf. 



Erect glandular annual herbs. Leaves alternate, mostly entire. Heads 

 corymbose or paniculate, radiate or discoid. Inflorescence campanulate to 

 obconic; bracts narrow, in 1-2 series, herbaceous, usually colored, at least at the 

 tips. Receptacle small, flat, naked. Ray-flowers, when present, pistillate, fer- 

 tile; ligules pink or rose-colored, broad, 3-cleft. Disk-flowers fertile; corollas 

 pink or rose, 5-divided almost to the tube. Style-branches filiform, pubescent 

 throughout. Achenes linear to narrowly obpyramidal, 4-angled. Pappus of 

 6-12 lanceolate, strongly ribbed squamellae. 



Heads radiate; leaves lanceolate to linear-lanceolate. 1. O. sphacelata. 



Heads discoid; leaves narrowly linear. 2. O. macrolepis. 



1. O. sphacelata (Nutt.) Rydb. Stem stout, branched, hispid, glandular- 

 pubescent and viscid above, 2-^6 dm. high; leaves petioled, lanceolate or linear- 

 lanceolate, scabrous on both sides, indistinctly 3-veined; involucre 10-15 mm. 

 high; ligules 8-10, rose-purple, 1-2 cm. long; pappus-scales of the disk-flowers 

 6-8, lanceolate, more than half as long as the achenes. Polypteris Hookeriana 

 A. Gray, in part, not Palafoxia Hookeriana T. & G. Sandy plains: Tex. Neb. 

 Colo. N.M.; n Mex. Son. Submont. 



2. O. macrolepis Rydb. Stem 3-4 dm. high, strigose-puberulent, and 

 glandular on the upper parts; leaves strigose-puberulent on both sides, 3-5 cm. 

 long, 2-3 mm. wide; involucres 9-10 mm. high and about as wide; bracts 8-12, 

 linear-oblanceolate, abruptly acute; disk-corollas 1415 mm. long; pappus-squa- 

 mellae 6-8, lanceolate, caudate-acuminate 5-6 mm. long. Plains: Colo. Au. 



99. RIGIOPAPPUS A. Gray. 



Slender puberulent annuals. Leaves alternate, linear, entire. Heads radi- 

 ate. Involucre turbinate; bracts subequal, in 2 series, linear-subulate, concave, 

 partly enclosing the ray-flowers; receptacle flat, naked. Ray-flowers 5-8, pis- 

 tillate, fertile; ligules short, scarcely exceeding the disk. Disk-flowers fertile. 

 Style-branches short, glabrous, with subulate hirtellous tips. Achenes slender, 

 linear, hispid. Pappus of 4 or 5 rigid subulate awn-like squamellae. 



1. R. leptocladus A. Gray. Stem slender, 1-3 dm. high, minutely hir- 

 sutulous; branches naked below and becoming longer than the main stem; leaves 



