COMPOSITE. (COMPOSITE FAMILY.) 217 



2. H. Canadense, Michx. Taller, robust, with corymbosely or panicu- 

 lately cymose heads: leaves from lanceolate to ovate-oblong, acute, sparsely 

 and acutely dentate or even laciniate, at least the upper partly clasping and broad 

 or broad ish at base : involucre usually pubescent when young, glabrate, occa- 

 sionally glandular ; the narrow outermost bracts loose : pappus sordid. Across 

 the continent near the British boundary and northward. 



2. Involucre a series of equal bracts and a few short ones : pappus of more or 

 less scanty equal bristles: akenes in some species slender or tapering to the 

 summit. 



* Hirsute with long and whitish or yellowish shaggy denticulate hairs commonlt/ 



from a small papilla, commonly but not always on the involucre also: flowers 

 yellow. 



3. H. longipilum, Torr. Stout, leafy to near the middle of the stem, 

 and with linear-lanceolate or subulate bracts up to the narrow panicle : pubes- 

 cence mainly glandular-setose and most abundant , the bristles upright, com- 

 monly \ to 1 inch long, fulvous or rufous : leaves spatulate-oblong or upper 

 lanceolate, thickish, the radical commonly present in a tuft at flowering time : 

 involucre 20 to 30-flowered, and with short peduncles more or less tomentu- 

 lose as well as glandular, in a narrow almost virgate panicle : akenes fusiform : 

 pappus at maturity fuscous. Woods and prairies, from Nebraska to Texas, 

 within the eastern limit of our range, and eastward to Michigan. 



4. H. Scouleri, Hook. Robust, a foot or two high: hairs long and soft 

 setose, whitish or yellowish: leaves lanceolate or spatulate-lanceolate, 3 to 6 

 inches long : panicle irregular or branching : involucre somewhat furfuraceous 

 and glandular, also sparsely or copiously beset with long bristly hairs : akenes 

 columnar and short : pappus whitish. From Montana to Oregon and south to 

 the Wahsatch. 



* * Dark-hirsute and somewhat glandular (also whitish with short tomentum) on 



the involucre: leaves and lower part ofscapiform stems not even pilose : Jlowers 

 yellow : pappus sordid. 



5. H gracile, Hook. Pale green, in tufts : leaves nearly all in radical 

 clusters, obovate- to oblong-spatulate and attenuate into petioles, entire or 

 repand-denticulate : stems or scapes slender, 8 to 18 inches high, cinereous 

 above, bearing few or several racemosely disposed livid heads, the lower 

 linear-bracteate : involucre usually blackish-hairy at base : akenes short co- 

 lumnar. Includes //. triste, mostly, of the Western Reports. Mountains of 

 Colorado, Utah, and northward. 



Var. detonsum, Gray. A span to nearly a foot high, with rather smaller 

 heads : dark hirsute hairs wholly wanting, or only some smaller ones on the 

 involucre. Synopt. Fl. i. 427. H. triste, var. detonsum, Gray. Mountains 

 of Colorado and California to those of British Columbia. 



* * * Not bristly (occasionally scattered bristles on the involucre and panicle), 



but at least the radical leaves and base of stem sparsely or thickly setose-hirsute 

 with long spreading hairs. 



+- Flowers white : stems leafy : akenes linear-columnar, not at all narrowed 

 upward : pappus sordid : leaves entire or denticulate. 



6. H. albiflorum, Hook. A foot to a yard high, smaller plants with 



