COMPOSITAE. 



269 



Leaves coriaceous, serrate; involucre well imbricated. A. conspicuus. 



Leaves^membranaceous, rarely somewhat serrate. 

 Involucre viscid or pruinose glandular. 



Leaves oblong-linear; heads few, subracemose. A. campestris. 



Leaves oblong to spatulate or lanceolate; heads 



numerous, in a panicle. A. integrif alius. 



Involucre not viscid or glandular. 



Heads small, less than 1 cm. broad. 



Rays white; involucre campanulate. A. multiflorus. 



Rays violet; involucre turbinate. A. columhianus . 



Heads larger, 1 cm. broad or more. 



Involucral bracts closely appressed, mainly coria- 

 ceous; leaves entire or nearly so. 

 Leaves glaucous ; akenes glabrous. A . laevis. 



Leaves puberulent ; akenes pubescent. A . jessicae. 



Involucral bracts looser, largely herbaceous. 



Leaves few, large, scarcely reduced upward, the 



cauline with auriculate or clasping bases. 



Heads solitary or few, long-ped uncled; 



leaves dark-green, usually glabrous. A. foliaceus 



Heads several; stems leafy to the top; leaves 



thin, pale, usually pubescent. A. cusickii. 



Leaves numerous, either small or much reduced 

 upward; cauline sessile, not at all 

 auriculate. 

 Involucral bracts, at least the outer ones, 

 foliaceous and passing into the leaves. 

 Leaves firm, entire, numerous. 

 Leaves thinner, less numerous, usually 

 serrate near the middle. 

 Involucral bracts not at all foliaceous. 

 Heads solitary, naked, pedunculate. 

 Heads corymbose. 



Leaves serrulate, those of the in- 

 florescence much reduced. 

 Leaves entire, those of the inflo- 

 rescence not much reduced. 



A. eatoni. 

 A. douglasii. 

 A. stenomeres. 



A. occidentalis. 



A . fremonti. 



Aster conspicuus Lindl. Stout smooth-stemmed herbs, 30-60 cm. high; 

 leaves oblong or obovate, thick and firm, acute or obtuse, serrate, 5-12 cm. 

 long, harshly-scabrous on both sides, all sessile; inflorescence glandular; 

 heads usually many, in large corymbs; involucre campanulate, 10-15 mm. 

 broad; bracts well imbricated, scarious, mostly acute, ciliate and glandular, 

 many of them green- tipped ; rays violet, 1-1.5 cm. long; akenes minutely 

 pubescent; pappus sordid. Open pine woods. Common. 



Aster campestris Nutt. Puberulent above and usually viscid-glandular; 

 stems simple or but little branched, 30-40 cm. high; leaves oblong-linear, 

 ascending, entire, ciliate, 3-nerved, acute, 3-5 cm. long; heads few, subrace- 

 mose, on leafy branchlets; involucre hemispherical, 6-7 mm. high; bracts 

 linear-lanceolate, acute, subequal, glandular-puberulent, in about 3 rows; 

 rays 20-30, violet; pappus sordid; akenes pubescent. Infrequent; at Spokane, 

 Waitsburg and Walla Walla. 



Aster integrifolius Nutt. Stems stout, usually simple, 30-60 cm. high, 

 sparsely villous below, viscid-glandular above; basal leaves large, firm, oblong 

 to spatulate, acute, apiculate, entire or obscurely serrulate, 10-20 cm. long; 

 cauline much smaller, lanceolate, half-clasping at the narrowed base; heads in 



