348 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



d. Heads mostly large, the involucres 6 (rarely 5) to 12 mm. high, 

 forming an erect terminal thyrse; species confined in Berkshire 

 County to Mt. Greylock and The Dome. 

 Heads very large, 8 to 12 mm. high, leaves thin; upper slopes of Mt. 



Greylock »S. macrophylla. 



Heads medium, 5 to 6 mm. high; leaves thick and firm; dry ledges 



on The Dome S. Randii. 



d'. Heads small, involucres 2 to 5 (rarely 6) mm. high; species of 

 general distribution. 

 e. Heads clustered in the axils, or in short spikes from the upper 

 axils, but not forming a dense, wand-like panicle, or a compact 

 pyramidal panicle. 

 /. Leaves and stems smooth or nearly so, not hoary or grayish. 



Stem terete (round), leaves all sessile S. caesia. 



Stem angled, the lower leaves abruptly narrowed to margined 



petioles S. latifolia. 



/.' Leaves and stems hoary or grayish. 



Rays of the flowers cream-color or nearly white. . . .S. bicolor. 



Rays of the flowers orange-yellow S. hispida. 



e'. Heads forming a dense wand-like or a compact pyramidal panicle. 

 g. Stem minutely hoary; plant of dry or sandy soil on rocky 



hill-tops and along the Deerfield R S. puberula. 



g'. Stem glabrous up to the inflorescence; plants of bogs and 

 wet meadows, or if in dry thickets only in the southern part 

 of the country, (n. b. — S. neglecta, before its racemes 

 spread, might be looked for here. It may be distinguished 

 in this stage from S. uliginosa by its broader lower leaves.) 



Plant of bogs and wet meadows S. uliginosa. 



Plant of dry open woods and thickets, so far noted only in 



Sheffield S. speciosa. 



c'. Heads in spreading open panicles, the form of inflorescence commonly 

 associated with golden-rods. 



h. Leaves commonly veiny, not 3-ribbed (but sometimes 



obscurely triple-nerved), (n. b. — S. ulmifolia might be 



looked for here. It may be distinguished by its thin 



leaves, usually beset .with soft hairs beneath.) 



i. Basal leaves long-petioled, conspicuously larger than 



the 10 to 30 (to 40) remote or sub-remote cauline ones. 



j. Stems strongly angled; leaves very rough on the 



upper surface; plant of bogs and swamps. 



S. patvla. 



j'. Stems rounded or nearly so; leaves smooth or smooth- 



ish. 



k. Leaves mostly serrate, the lower and middle cauline 



(as well as the basal) rather abruptly narrowed to 



the base; racemes pubescent S. arguta 



