COMPOSITAE. 371 



Bucephalus macounii Greene. Sparsely rough pubescent; leaves oblong- 

 lanceolate to oblong, sessile, acute, half-clasping at base, sharply serrate with 

 scattered teeth; heads few, corymbose; involucre turbinate; tegules lanceolate, 

 acute, purple tinged, pubescent and ciliate, arranged in about 4 series; ray- 

 flowers 10-15, narrow, violet; akenes pubescent. 



Victoria, Macoun; no specimens have been seen and the description is 

 compiled. 



510. ASTER. 



Mostly perennial herbs; leaves alternate; heads solitary, 

 corymbed or panicled, many-flowered, radiate; ray-flowers 

 several or numerous, in one row, fertile or rarely sterile, white, 

 purple or blue, never yellow; disk-flowers yellow, often turning 

 purple; involucre imbricated; tegules commonly with herbaceous 

 tips; receptacle flat or convex, naked; pappus tawny, simple, of 

 copious slender scabrous capillary bristles; anthers tipped with 

 an appendage; styles appendaged; akenes more or less com- 

 pressed, rarely slender, 4-5-nerved. 



Leaves coriaceous; involucre well imbricated, broadly turbinate, 



not glandular. A. radulinus. 



Leaves membranaceous; involucre hemispheric, not well im- 

 bricated. 



Involucre viscid or pruinose-glandular. A. major. 



Involucre not viscid or glandular. 

 Heads less than 1 cm. broad. 



Tegules acute. A. oreganus. 



Tegules obtuse. A. hallii. 



Heads more than 1 cm. broad. 



Cauline leaves auriculate at base. A.foliaceus. 



Cauline leaves not auriculate at base. A. douglasti. 



Aster radulinus Gray. Herbage scabrous and pubescent; stems stout, 

 20-50 cm. high, mostly branched above; leaves firm, subcoriaceous, broadly- 

 lanceolate to obovate, sharply serrate, tapering at base, 5-10 cm. long, scab- 

 rous on both sides; heads corymbose; involucre turbinate or obconical, 68 

 mm. high; tegules imbricated, firm, oblong-lanceolate, obtuse or abruptly 

 acute, pubescent; ray-flowers violet or nearly white, short; akenes pubescent. 



In dry ground, Vancouver Island to California. 



Aster major (Plook.) Porter. (A. modesta Lindl.) Herbage sparsely 

 pubescent, glandular in the inflorescence; sterns 60-80 cm. high, branched 

 above, leafy; leaves thin, lanceolate to oblong-lanceolate, serrate or subentire, 

 acute, sessile or partly clasping at the narrowed base, 5-10 cm. long; heads 

 15-20 cm. broad, numerous in a leafy bracted corymb or panicle; involucre 

 hemispheric; tegules green, loose, linear, acute, little imbricated, glandular; 

 ray-flowers 30-50, dark violet, 10-12 mm. long; akenes pubescent; pappus 

 tawny. 



Common along streams in the mountains. 



Aster oreganus Nutt. Glabrous or nearly so; stems slender, 40-60 cm. 

 high, branched at top; leaves linear-lanceolate, entire, sessile, 4-6 cm. long; 

 inflorescence subracemose, rather dense; heads 5-7 mm. high; involucre loose, 

 the outer tegules herbaceous, lanceolate, acute, the inner ones thinner and 

 narrower; ray-flowers white or purple, 4 mm. long; akenes scaberulous. 



In wet places, rare; first collected by Nuttall near the mouth of the \Yilln- 

 mettc River. 



