188 COMPOSITE, (composite family.) 



* Chaffy bracts of the receptacle soft and scarious : akenes with some long villous 



hairs on the margins and sometimes on the faces. 

 ■*- Heads showy, large or middle-sized, soliiari/, or some later ones axillary : bracts 



of the involucre loose and lanceolate-attenuate or linear, more or less foliaceous, 



conspicuously hirsute- ciliate : disk yellowish. 



1. H. quinquenervis, Gray. Somewhat hirsutely pubescent or almost 

 glabrous: stems solitary or scattered, 2 to 4 feet high: leaves mostly opposite, 

 oblong- or ovate-lanceolate, acumiuate, 4: to 9 inches long, uppermost sessile, lower 

 ones tapering into margined petioles, and the lowest {afoot or more long) into 

 longer petioles : head mostly long-peduncled, ample, the disk a full inch in 

 diameter : rays 15 to 20, pale yellow, commonly inch and a half long: pappus 

 of 2 slender awns, of half the length of the akene, and nearly thrice the length oj 

 the squamellce, which form a conspicuous finely dissected fringe. — Proc, Am. 

 Acad. xix. 10. //. unifora of the Fl. Colorado and Bot. King's Exp. Moun- 

 tains from South Dakota and Montana to S. Colorado. 



2. H. Parryi, Gray. Hispidulous-hirsute : stems numerous from a thick- 

 ened root, a foot high, rather slender : leaves mostly alternate, more rigid, lanceo- 

 late and an inch or two long, or the lowest and radical oblong- spatulate and of 

 double the size : heads and rays barely half the size of the preceding : pappus of 

 fimbriately dissected squamellce only, or with a pair of slender aAvns not surpass- 

 ing these. — Proc. Acad. Philad. 1863, 68. Mountains of Colorado and New 

 Mexico. 



■t- H- Heads small: imwlucre more imbricated: rays few and hardly surpassing 

 the dark purple disk. 



3. U. microcephala, Gray. Hispidulous-scabrous : stems numerous 

 from a greatly thickened root, a foot or less high, slender, somewhat pauicu- 

 lately or corymbosely branched at summit and bearing several heads : leaves 

 rigid, all but the lower alternate ; radical lanceolate-spatulate ; upper cauline 

 nearly linear and sessile, an inch long : involucral bracts linear-oblong, mostly 

 obtuse : rays not over 3 lines long : pappus of several slender squamelliB inter- 

 mixed with the long hairs, two marginal ones often extended and awn-like. — 

 Proc. Am. Acad, xix. 10. Borders of Colorado and adjacent New Mexico and 

 Utah. . 



* * Chaffy bracts of the receptacle firm-chartaceous : stems afoot or two high. 



4. H. uniflora, Torr. & Gray. Minutely pubescent or glabrate : leaves 

 more commonly opposite, sometimes all alternate, oblong-lanceolate, 2 to 5 

 inches long ; lower short-petioled : involucre pubescent or slightly hirsute : 

 rays a full inch long : akenes more or less ciliate : pappus a pair of long awns 

 and rather conspicuous squamellse. — Gray, Proc. Am. Acad. xix. 10. H. multi. 

 caulis of Bot. King's Exp. Mountains of Montana and E. Idaho to S. Utah. 



41. VERBESINA, L. 



Flowers yellow or rarely white. Ours belongs to § Ximenesia, in which the 

 heads are broad, the involucre of spreading linear and foliaceous equal bracts, 

 and the disk and receptacle merely convex : the rays are numerous and con- 

 spicuous. » 



