COMPOSITAE. 357 



late or rarely solitary; flowers yellow or sometimes white; tegules 

 in two rows; receptacle flat, naked; pappus of a single row of 

 rough tawny bristles which are not plumose; corollas all ligulate; 

 akenes oblong or columnar, terete or 4- or 5-angled, mostly 

 10-ribbed or striate, the apex truncate. 



Stems many-lcavcd; involucre imbricated. H. canadense. 



Stems few- leaved; involucre a series of equal tegules and a 

 few short calyculate ones. 

 Flowers white; involucre nearly glabrous. H. albiflorum. 



Flowers yellow. 



Heads small, black-hairy. H. gracile. 



Heads larger, not black-hairy. 

 Involucre densely long-hairy. 



Cauline leaves ample, half-clasping at the 



broad bases. H. longiberbe. 



Cauline leaves much reduced. H. scouleri. 



Involucre with few or no long hairs. 



Leaves nearly smooth. , H. cynoglossoides. 



Leaves hairy. 



Leaves densely hirsute. H. griseum. 



Leaves thinly white tomentose. H. cinereiim. 



Hieracium canadense Michx. Somewhat scabrous throughout; stems 

 stout, 30-120 cm. high; leaves numerous, lanceolate, entire or incisely serrate, 

 sessile and somewhat clasping at base, gradually smaller upwards, 1-10 cm. 

 long, none clustered at base; heads corymbed, rarely solitary, on stout pe- 

 duncles; involucre hemispheric, puberulent or glabrous, sometimes glandular, 

 1-2 cm. broad; tegules in 2-3 series, the uppermost loose; akenes columnar; 

 pappus brownish. 



In open ground, very rare west of the Cascade Mountains; Coupeville, 

 Gardner. 



Hieracium albifionuii Hook. Stems slender, erect, 50-80 cm. high, villous 

 below; leaves oblong or oblong-spatulate, thin, entire or faintly toothed, the 

 lower tapering into broad petioles, the upper mostly sessile, all beset with 

 sparse villous white hairs, especially the lowest; heads 15-30-flowered; in- 

 volucre narrow, glabrous or with a few hairs, the tegules linear-lanceolate, pale; 

 akenes strongly striate. 



Very common in dry open woods. 



Hieracium gracile Hook. Tufted; stems usually several, 15-30 cm. high; 

 leaves mostly basal, oblong-spatulate, entire or nearly so, broadly pctiolatc, 

 3-8 cm. long, glabrous or merely puberulent ; heads several, racemose or corym- 

 bose; involucre 8 mm. high, blackish with both hirsute and glandular hairs; 

 akenes cylindric; pappus sordid or fuscous. 



Common in alpine meadows at 1500-2000 m. altitude. 



Hieracium longiberbe Howell. Herbage sparingly hirsute with long white 

 hairs; stems 30-50 cm. high; leaves lanceolate, entire or denticulate, 6-15 cm. 

 long, the cauline scarcely reduced and half-clasping by the broad base; heads 

 few in a cyme; involucre 12 mm. high, densely shaggy with long white hairs, 

 not glandular; principal tegules 10-20, lanceolate, acuminate. 



On perpendicular cliffs along the Columbia River. 



Hieracium scouleri Hook. Erect, 30-60 cm. high, densely beset throughout 

 with long soft white hairs swollen at the bases; basal leaves lanceolate or ob- 

 lanceolate, entire, acute or obtuse, 10-20 cm. long, tapering into margined 



