This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Aster novi-belgii L. Sp. Pl. 877. 1753. Aster novi-belgii elodes A. Gray, Syn. Fl. 12: 190. 1884. Aster novi-belgii litoreus A. Gray, loc. cit. 189. 1884. Aster novi-belgii atlanticus Burgess; Britt. & Brown, 111. Fl. 3: 370. 1898. Aster novi-belgii Brittonii Burgess, loc. cit. 371. 1898.
Stem slender, usually much branched, glabrous, or slightly pubescent above, 1°-3° high. Leaves lanceolate, oblong-lanceolate, or linear-lanceolate, firm, often somewhat fleshy, entire, or slightly serrate, glabrous, or very nearly so, acuminate at the apex, narrowed, sessile and more or less clasping at the base, 2'-6' long, 3"-8" wide, the lowest petioled; heads corymbose-paniculate, usually numerous, 10"-15" broad; involucre hemispheric to campanulate, its bracts linear, acute, or obtusish, green, somewhat spreading, in 3-5 series, the outer shorter; rays 15-25, violet, 4"-5" long; pappus whitish; achenes glabrous or nearly so.
In swamps, Newfoundland to Maine and Georgia, mainly near the coast. Races differ in leaf-form and in the involucrai bracts. Aug.-Oct.
Aster longifolius Lam. Encycl. 1: 306. 1783.
Aster longifolius villicaulis A. Gray, Syn. Fl. 1: Part 2, 189. 1884.
Stem glabrous, or pubescent, leafy, paniculately branched, 1°-3° high. Leaves lanceolate to linear-lanceolate, entire, or nearly so, acuminate at the apex, narrowed into a sessile clasping usually slightly cordate base, 3'-8' long, 2"-6" wide; heads rather numerous, about 1' broad; involucre hemispheric, 4"-5" high, its bracts glabrous, narrow, green, acute, imbricated in few series, nearly equal; rays numerous, 2V-7" long, violet or pale purple; pappus pale.
In swamps and moist ground, Labrador to Saskatchewan, northern New England, Ontario and Montana. Summer.
Stem usually stout, sparingly pubescent in lines, 2°-3° high, branched above, the branches ascending. Leaves lanceolate, acute at the apex, entire, or with a few small distant teeth, glabrous on both sides, very rough-margined, 2'-4 long, 1/2'-1' wide, the upper clasping at the base, the lowest petioled; heads few, 1'broad or more; involucre hemispheric, its bracts green, foliaceous, oblong, the inner narrower and acute; rays about 30, violet, 4"-5" long; pappus nearly white; achenes pubescent.
Mountains of Quebec; Oregon to Alaska. July-Sept. The figure of this species in our first edition was erroneously stated to have been drawn from specimens collected in western Nebraska.