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 phyllodes Rydb. Bull. Torn Club 37: 145. 1910.
Stem rather slender, somewhat branched, loosely pubescent, 2°s° high. Leaves oblong-lanceolate, entire, or sparingly low-dentate, the larger 4' long or less, 1/2'-1' wide, acute or acutish at the apex, narrowed to a subcordate and slightly clasping base, rough-margined, glabrous on both sides; heads leafy-paniculate, about 1' broad; involucre hemispheric, its bracts narrowly oblong, foliaceous, acute; rays purplish; achenes pubescent.
Aster sericeus Vent. Hort. Cels, pl. 33. 1800.
Aster argenteus Michx. Fl. Bor. Am. 2: til. 1803.
Stem slender, paniculately or corymbosely branched, stiff, glabrous, leafy, 1°-2° high. Stem leaves sessile, with a broad base, oblong, entire, mucronate, 1/2'-1 1/2' long, 2"-5" wide, erect or ascending, with a dense silvery-white silky pubescence on both sides; basal and lowest leaves oblanceolate, narrowed into margined petioles; heads numerous, about 1 1/2 broad; involucre turbinate, its bracts oblong, or the inner lanceolate, canescent, imbricated in 3 or 4 series, their tips green, acute, spreading; rays 15-25, violet-blue, 6"-8" long; pappus tawny; achenes glabrous.
In dry open soil, Illinois to Minnesota, Manitoba, South Dakota, Tennessee, Missouri and Texas. Aug.-Scpt.
Aster concolor L. Sp. Pl. Ed. 2, 1228. 1763.
Stem slender, glabrous, or pubescent above, 1°-2 1/2° high, leafy, simple, or with few erect branches. Leaves oblong or linear-oblong, finely and densely canescent on both sides, or the lower glabrate, sessile, obtuse or mucronate, 1Y-2' long; heads numerous in an elongated narrow raceme resembling Laciuaria; involucre broadly turbinate, its bracts linear or linear-oblong, appressed, canescent, imbricated in 4 or 5 series, their tips green, acute, the outer shorter; rays 10-15, lilac, 3"-4" long; pappus tawny; achenes villous.
In dry sandy soil, eastern Massachusetts and Rhode Island to Florida, Tennessee and Louisiana, mostly near the coast. Lilac-flowered aster. Aug.-Oct.
Aster Nuttallii var. Fendleri A. Gray, Pac. R. R. Rep. 4: 97. 1856.
Stems several or solitary from thick woody roots, rigid, hirsute, 6'-12' high. Leaves linear, rigid, 1-nerved, acute or acuminate, 8"-15" long, 1"-1 1/2" wide, glabrous on both sides, but the margins bristly-ciliate; heads usually few and racemose, 1/2'-1' broad; involucre turbinate, its bracts glandular, linear-oblong, imbricated in about 4 series, the inner acute, the outer shorter and obtuse; rays 10-15, violet, 3"-5" long.
In dry soil on the plains, Nebraska and Kansas to Colorado and New Mexico. Aug.-Sept.