Flora of the Palouse Region 187 



tuse, entire or rarely serrate, 5-15 cm. long; the basal petioled; the cauline 

 sessile or half-clasping by a broad base: inflorescence loosely paniculate or 

 corymbose: involucre turbinate, about 1 cm. broad; the rigid bracts well-im- 

 bricated, acute, appressed, green-tipped: rays violet, S-12 mm. long: akenes 

 glabrous or nearly so: pappus sordid. Near Palouse City. 



A. canescens var. viscosus Gray. Biennial, erect and simple or branch- 

 ing from the base, 30-60 cm. high, whitish-puberulent throughout: leaves 

 rigid, linear-lanceolate or the lower spatulate, cuspidately-toothed or entire, 

 2-6 cm. long, those of the flowering branches much reduced: heads usually 

 numerous, paniculate or corymbosely arranged: involucre turbinate-cam- 

 panulate, 1-1.5 cm. broad; the bracts in numerous imbricated ranks, the 

 tips green, very glandular and spreading or recurved: rays purple or violet, 

 S-10 mm. long: akenes canescent: pappus sordid. Bluffs of Snake River. 



A. jessicae Piper. (A. latahensis Henderson). Perennial, tufted, 1-1.5 

 m. high, soft-pilose throughout: basal leaves ovate or oval, acute or acumi- 

 nate, entire or few-toothed, long- petioled, 6-10 cm. long; cauline broadly 

 lanceolate, acute, entire, narrowed at base into a short broadly-margined 

 petiole or sessile, 2-10 cm. long: heads in loose panicles, the peduncles 

 stout, leaf}-: involucre campanulate, 1— 1.7 cm. broad, the bracts green, lance- 

 olate, acute, softly- pubescent, the lower little shorter, some of them integrad- 

 ing into the leaves: rays violet, broad, 1 cm. or more long: akenes pubescent: 

 pappus sordid. Low ground along the Palouse and Union Flat. 



A. OCCidentalis var. intermedius Gray. Perennial, erect, glabrous or 

 nearly so: leaves rather thick; the basal lanceolate, acute, somewhat serrate 

 or entire, petioled; the cauline sessile, lanceolate, mostly serrate, the upper- 

 most much reduced: inflorescence loosely corymbose-paniculate: involucre 

 campanulate, 10-12 cm. broad, the bracts loosely imbricated, subequal, lin- 

 ear, acute, green but not at all foliaceous: rays violet or white, 1 cm. long: 

 akenes sparsely pilose: pappus sordid. Banks of Snake River at Almota. 



A. fremontii Gray. Perennial, somewhat pubescent or nearly glabrous, 

 .5-1 m. high, usually branched above: larger leaves thin, oblong-lanceolate, 

 entire, acute or obtuse, scabrous on the margin, 2-5 cm. long, only the low- 

 ermost petioled, the others sessile and partly clasping, those on the flower- 

 ing branches small, linear: heads loosely corymbose, the peduncles nearly 

 naked: involucre 7-9 mm. high, broadly campanulate, the bracts all alike, 

 linear, acute, loosely imbricated, nearly equal: rays violet, 6-8 mm. long. 

 In moist copses, common and variable. 



311. ERIGERON. 



Herbs: very similar to Aster, but differing in the usually naked - 

 peduncled heads: involucre simpler, of narrow and erect equal 

 bracts, not coriaceous and without herbaceous tips: rays narrower 

 and usually very numerous, often in more than one row: pappus 

 more scanty or fragile, sometimes with a conspicuous short outer 

 row: style appendages very short and roundish or obtuse: akenes 

 mostly 2 -nerved. 



