eOMPOSITAE. 369 



nearly glabrous, 5-6 mm. high; ray-flowers about 100, narrow, violet, about 

 1 cm. long; akenes pubescent; pappus double, the outer bristles very short. 

 Gravelly soil, infrequent. 



Erigeron philadelphicus L. Perennial, sparsely hairy; stems erect, branched 

 above, 30-90 cm. high; basal leaves oblong or oblong-obovate, obtuse, dentate, 

 3-6 cm. long, narrowed into a short petiole; cauline mostly entire, sessile and 

 half-clasping; heads numerous in a corymb; involucre hemispheric; ray-flowers 

 pink, numerous, very narrow; akenes puberulent. 



Moist banks and meadows, common. 



Erigeron howellii Gray. Perennial, glabrous except near the top; stems 

 30-50 cm. high, leafy; leaves entire or merely denticulate, thin in texture, 

 glabrous; basal ones petioled, ovate to obovate; cauline half-clasping at base, 

 ovate, mucronate, 2-5 cm. long; heads solitary; involucre somewhat pubes- 

 cent; tegules subulate; ray-flowers 30-35, white, 15-20 mm. long. 



Perpendicular bluffs along the Columbia Gorge in moist places. 



Erigeron amplifolius Howell. Green nearly glabrous; stems erect, 50-70 

 cm. high; leaves entire or with a few teeth, the basal ones lanceolate to ovate- 

 lanceolate, 5-10 cm. long, slender petioled, gradually reduced, the upper 

 sessile; heads solitary or few, short-peduncled; involucre hemispheric, 10-12 

 mm. broad; tegules linear, acute, minutely glandular and sparsely pilose along 

 the midrib; ray-flowers 50-60, blue or violet, about 2 cm. long; akenes pubes- 

 cent. 



On open hillsides near Table Rock, Clackamas County, Oregon, Howell. 



Erigeron salsuginosus (Richards.) Gray. Perennial; stems erect, 30-60 

 cm. high, pubescent toward the top; lower leaves petioled, spatulate to nar- 

 rowly-obovate, entire or denticulate, green, glabrous, 5-20 cm. long; cauline 

 oblong-lanceolate, sessile; heads solitary or few; involucre loose, subulate- 

 linear, viscid and minutely pubescent; ray-flowers 50-70, pink, 12-15 mm. 

 long, rather broad. 



Abundant in alpine meadows at 1500 to 2000 m. altitude, sometimes called 

 " Mountain Daisy." 



Erigeron salsuginosus angustifolius Gray. Stems 15-20 cm. high; leaves 

 narrower, spatulate to lanceolate. 



This is merely a reduced high altitude form of E. salsuginosus. 



507. SERICOCARPUS. 



Perennial herbs, with many sessile alternate mostly entire 

 leaves and small heads of whitish flowers in corymbs; heads 12- 

 20-flowered, radiate; involucre cylindric or somewhat clavate; 

 tegules appressed, closely imbricated, coriaceous but with spread- 

 ing green tips; ray-flowers few, 4 or 5; receptacle foveolate; 

 style branches lanceolate-subulate; akenes pubescent; pappus of 

 numerous scabrous capillary bristles. 



Sericocarpus rigidus Lindl. Herbage pale green and scabrous; stems 

 30-60 cm. high, leafy; leaves oblong-spatulate, obtuse and usually mucronate, 

 entire, stiff but hardly rigid, 2-2.5 cm. long; inflorescence a rather dense 

 corymb; involucre turbinate; tegules oblong to linear, 1 -nerved; akenes canes- 

 cent, half as long as the white pappus. 



In dry ground, Vancouver Island to California. 



