COMPOSITAE (COMPOSITE FAMILY) 595 



Involucre imbricated, i. e., the bracts in 2 or more successively 



shorter series; leaves numerous. 



Leaves usually subentire and narrowly lanceolate . . . 1. H. umbellatum. 

 Leaves usually broadly lanceolate or ovate-oblong, and acutely 



dentate 2. H. canadense. 



Involucre not regularly imbricated, a series of equal bracts and 



some short calyculate ones; leaves relatively few. 



Achenes tapering from base to summit 3. H. Fendleri. 



Achenes cylindrical. 



Flowers white or ochroleucous . . . . . . 4. H. albiflorum. 



Flowers yellow. 



Heads small, black-hairy 5. H. gracile. 



Heads large, white-hairy or glabrate. 



Leaves densely long-hirsute . . . . . . 6. H. Scouleri. 



Leaves nearly smooth * . 7. H. cynoglossoides. 



1. Hieracium umbellatum L. Sp. PI. 804. 1753. Stems 3-6 dm. high, 

 strict, bearing a few somewhat umbellately disposed heads: leaves narrowly 

 or sometimes broadly lanceolate, nearly entire, sparsely denticulate, occa- 

 sionally laciniate-dentate, all narrow at base: involucre usually livid, gla- 

 brous or nearly so; outermost bracts loose or spreading. (H. columbianum 

 Rydb. Bull. Torr. Bot. Club 28: 513. 1901.) Across the continent through 

 the northern part of our range. 



2. Hieracium canadense Michx. Fl. 2: 86. 1803. Taller, robust, with 

 cormybosely or paniculately cymose heads: leaves lanceolate to ovate-oblong, 

 acute, sparsely and acutely dentate or even laciniate, at least the upper partly 

 clasping and broad or broadish at base: involucre usually pubescent when 

 young, becoming glabrate, occasionally glandular; the narrow outermost bracts 

 loose: pappus sordid. Across the continent through the northern part of 

 our range, and far northward. 



3. Hieracium Fendleri Schultze Bip. Bonplandia 9: 173. 1861. Sub- 

 scapose, not rarely 1 or 2 leaves toward base of the simple or paniculately 

 branching stem, sparsely setose-hirsute: radical leaves spatulate or broader; 

 the cauline verging to lanceolate, reduced above to linear bracts: heads few 

 and racemif orm-paniculate, or more numerous and corymbosely disposed : in- 

 volucre puberulent or glabrate, with or without scattered setose hairs: achenes 

 tapering from near the base to summit, sometimes reddish, at length commonly 

 blackish: pappus copious, soft, sordid-whitish. Colorado and New Mexico. 



4. Hieracium albiflorum Hook. Fl. Bor. Am. 1: 298. 1834. Stems 5-9 dm. 

 high, leafy below, nearly naked above, ending in a panicle of white-flowered 

 heads; herbage thickly beset below with tawny bristly hairs, glabrous above 

 except for a minute glandular pubescence and sometimes a few soft hairs on 

 the inflorescence : lower leaves oblong, narrowed at base to a winged petiole, 

 10-15 cm. long, 2-4 cm. broad, entire to saliently repand-dentate ; upper leaves 

 oblanceolate to linear, those of the inflorescence linear-attenuate: pappus dull 

 white. In open coniferous woods, in the mountains; our range and westward. 



5. Hieracium gracile Hook. 1. c. 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, 2-4 dm. high, cinereous 

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

 linear-bracteate: involucre usually blackish-hairy at base: achenes short- 

 columnar. Mountains of Colorado, Utah, and northward. 



5a. Hieracium gracile detonsum Gray. A reduced form with most of the 

 dark hairs wanting, except a few on the involucre. High mountains; west- 

 ern part of our range. * 



56. Hieracium gracile minimum A. Nels. A dwarf alpine form, sometimes 

 but a few cm. high and with a solitary head. In the higher mountains. 



6. Hieracium Scouleri Hook. 1. c. Strikingly pubescent with long crisp 

 hairs, pale and more or less glaucescent; stems 3-7 dm. high, very leafy: 

 leaves lanceolate, sessile or the lowest short-petioled, 5-15 cm. long: heads 

 rather few, in a loose irregular panicle; involucre 12 mm. high; the bracts 

 linear-lanceolate, often acuminate, imbricated in 2 or 3 series, the outer 

 successively shorter, all beset with long bristly hairs, and more or less glan- 

 dular: pappus whitish. Coming into our range from the north Pacific States. 



