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-leaved; 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. cinereum. 



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 albiflorum Hook. Stems slender, erect, 50-80 cm. high, villous%/A0 /M 

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

 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 petiolate, 

 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 



