32. Aster Tardiflorus L. Northeastern Aster

Fig. 4313

Aster .ardiflorus L. Sp. Pl. Ed. 2, 1231. 1763.

Aster patulus Lam. Encycl. 1: 308. 1783.

Stem glabrous, slightly pubescent, or villous, corymbosely branched near the summit, 1°-3° high. Leaves lanceolate, oblong-lanceolate, or ovate-lanceolate, serrate with low teeth, or some of them entire, acuminate at the apex, narrowed into a slightly clasping base, or the lower into winged petioles, glabrous or nearly so on both sides, rough-ish-margined, 3'-6' long, 4"-10" wide; heads about 1' broad, not very numerous, involucre hemispheric, its bracts often 6" long, acute, somewhat unequal; rays 20-30, violet; pappus nearly white; achenes pubescent.

Along streams, New Brunswick to Pennsylvania. Aug.-Oct.

33. Aster Prenanthoides Muhl. Crooked-Stem Aster

Fig. 4314

A. prenanthoides Muhl.; Willd. Sp. Pl. 3: 2046. 1804.

Aster prenanthoides porrectifolius Porter, Mem. Torr. Club 5: 326. 1894.

Stem glabrous, or pubescent in lines above, flexuous, much branched, 1°-2° high. Leaves thin, oblong to ovate-lanceolate, or lanceolate, sharply and coarsely serrate, scabrous above, glabrous or nearly so beneath, 3'-8' long, 9"-18" wide, acuminate at the apex, abruptly narrowed below into a broad margined entire petiole, the base auriculate-clasping; heads usually numerous, 1'broad or more; involucre hemispheric, its bracts linear, acute, green, spreading, imbricated in 3 or 4 series, the outer shorter; rays 20-30, violet, 4"-6" long; pappus tawny; achenes pubescent.

In moist soil, Massachusetts to Minnesota, Virginia, Kentucky and Iowa. Aug.-Oct.

Aster schistdsus Steele, of West Virginia, is intermediate in characters between this species and A. Lowrieanus Porter, and may be a hybrid.

33 Aster Prenanthoides Muhl Crooked Stem Aster 98533 Aster Prenanthoides Muhl Crooked Stem Aster 986

34. Aster Laevis L. Smooth Aster

Fig. 4315

Aster laevis L. Sp. Pl. 876. 1753.

Aster laevis amplifolius Porter, Mem. Torr. Club 5:

324. 1894. Aster laevis potomacensis Burgess; Britt. & Brown, 111. Fl. 3: 369. 1898.

Stem usually stout, glabrous, often glaucous, 2°-4° high, branched or simple. Leaves thick, entire, or serrate, glabrous, slightly rough-margined, the upper all sessile and usually cordate-clasping, lanceolate, oblong-lanceolate, oblanceolate or ovate, acute or obtusish, 1'-4 long, 4"-2' wide, the basal and lower gradually narrowed into winged petioles, those of the branches often small and bract-like; heads usually numerous, about 1' broad; involucre campanulate, its bracts rigid, acute, appressed, green-tipped, imbricated in several series; rays 15-30, blue or violet; pappus tawny; achenes glabrous or nearly so.

Usually in dry soil, Maine to Ontario, Virginia, Alabama, Louisiana, Saskatchewan, Missouri and Colorado. Races differ in leaf-form. Sept.-Oct.