Stems rigid, erect, smooth or somewhat pubescent above, striate, corymbosely branched at the top, 1 to 8 feet high from a perennial root. Leaves lanceolate to oblong-lanceolate, ascending, smooth above, usually slightly pubescent beneath, long pointed at the apex, narrowed into short petioles or the upper leaves sessile, hispid-margined, 5 to 6 inches long and one-half to 1 inch wide, the lower leaves reduced in size; basal leaves none. Heads of flowers numerous, one-half to three-fourths of an inch broad in large terminal compound corymbs. Involucres broadly bell-shaped or hemispheric, about one-sixth of an inch high, their bracts lanceolate, appressed, thin, usually pubescent or ciliate, overlapping in three or four series, the outer ones shortest. Ray flowers ten to fifteen in number, white, pistillate. Disk flowers perfect, the corolla with a slender tube, abruptly expanded into a bell-shaped five-lobed limb; achenes obovoid; pappus double, the outer series of numerous short bristles or scales, the inner series of numerous hairlike bristles, some of which have thickened tips. In moist soil, open woods, thickets and marshes, Newfoundland to Saskatchewan, south to Georgia, Michigan and Iowa. Flowering from July to October.
Memoir 15 N. Y. State Museum
Tall Flat-Top White Aster - Doellingeria umbellata