Stems slender, stiff, usually rough above, frequently several from a single perennial root, corymbosely branched toward the summit, 1 to 2 feet high. Leaves linear-lanceolate, one to three-nerved, entire or with a few distant teeth on the margins, firm, shiny, rough or ciliate on the margins, sessile or very short petioled, the lower and basal ones 3 to 6 inches long, the upper leaves smaller and those of the branches very much reduced in size. Heads of flowers two-thirds to 1 inch broad. Bracts of the nearly hemispheric involucres linear-oblong, smooth, green, overlapping in about four series. Ray flowers ten to twenty in each head, white, one-fourth to one-third of an inch long; pappus white.

In dry or rocky soil, Massachusetts to Vermont and Saskatchewan, south to Pennsylvania, Illinois and Colorado. Flowering from July to September.

Memoir 15 N. Y. State Museum

Plate 246

A. Upland White Aster   Aster ptarmicoides

A. Upland White Aster - Aster ptarmicoides