70. Aster Nemoralis Ait. Bog Aster

Fig. 4351

Aster nemoralis Ait. Hort. Kew. 3: 198. 1789. Aster nemoralis Blakei Porter, Bull. Torr. Club 21: 311. 1894.

Stem puberulent, slender, simple, or corym-bosely branched above, 6'-2° high. Leaves sessile, oblong-lanceolate or linear-oblong, acute at each end, pubescent or puberulent on both sides, dentate or entire, 1-3' long, 1 1/2"-10" wide, margins often revolute; heads several, or solitary, 1'-1 1/2' broad, the peduncles slender; involucre broadly obconic to hemispheric, its bracts ap-pressed, linear-subulate, acute or acuminate, imbricated in about 3 series; rays 15-25, light violet-purple to rose-pink; achenes glandular-pubescent; pappus white.

In sandy bogs, New Jersey to northern New York, Ontario, Newfoundland and Hudson Bay. Races differ in leaf-form and serration. Aug.-Sept.

71. Aster Acuminatus Michx. Whorled Or Mountain Aster

Fig. 4352

Aster divaricatus Lam. Encycl. 1: 305. 1783. Not L.

1753. Aster acuminatus Michx. Fl. Bor. Am. 2: 109. 1803.

Stem pubescent or puberulent, zigzag, corym-bosely branched, often leafless below,1°-3° high. Leaves thin, broadly oblong, acuminate at the apex, narrowed to a somewhat cuneate sessile base, sharply and coarsely dentate, pinnately veined, glabrous or pubescent above, pubescent at least on the veins beneath, 3'-6' long, 1/2'-1 1/2' wide, often approximate above, and appearing whorled; heads several or numerous, 1'-1 1/2' broad; involucre nearly hemispheric, its bracts subulate-linear, acuminate, the outer much shorter; rays 12-18, narrow, 6"-8" long, white or purplish; pappus soft, fine, nearly white; achenes pubescent.

Moist woods, Labrador to Ontario, western New York, and in the mountains to Tennessee and Georgia. July-Oct.

71 Aster Acuminatus Michx Whorled Or Mountain Aste 1023

72. Aster Ptarmicoides (Nees). T. & G. Upland White Aster

Fig. 4353

Chrysopsis alba Nutt. Gen. 2: 152. 1818. Not A. albus Willd. Doellingeria ptarmicoides Nees, Gen. & Sp.

Ast. 183. 1832. A. ptarmicoides T. & G. Fl. N. A. 2: 160.

1841. Unamia alba Rydb. Bull. Torr. Club 37:

146. 1910.

Stems tufted, slender, rigid, usually rough above, corymbosely branched near the summit, 1°-2° high. Leaves linear-lanceolate, 1-3-ribbed, entire, or with a few distant teeth, firm, shining, rough-margined or ciliate, sometimes scabrous, acute, narrowed to a sessile base, or the lower petioled, the lowest and basal ones 3'-6' long, 2"-4" wide, the upper smaller, those of the branches linear-subulate; heads 8"-12" broad; involucre nearly hemispheric, 2"-3" high, its bracts linear-oblong, obtuse, or the outer acutish, appressed, nearly glabrous, green, imbricated in about 4 series; rays 10-20, white, 3"-4" long; pappus white; achenes glabrous.

In dry or rocky soil,. Massachusetts, Vermont and Ontario to Saskatchewan, Illinois, Missouri and Colorado. July-Sept.

72 Aster Ptarmicoides Nees T G Upland White Aster 1024

Aster lutescens (Lindl.) T. & G. is a very interesting race with light yellow rays, known from Illinois, Wisconsin and Saskatchewan. Yellow rays are otherwise almost or quite unknown in the genus Aster as here limited.