814 



COMPOSITAE (COMPOSITE FAMILY) 



963. A. tardiflorns. 



964. A. prenantboides. 



*+ -M. Cauline leaves (at least the lowest} conspicuously contracted into a winged 

 petiole-like base or auriculate-clasping ; involucre lax. 



47. A. tardiflbrus L. Glabrous or subpubescent, 0.3-1.5 m. high ; leaves 

 ovate- or oblong-lanceolate, sharply serrate in the middle, narrowed at both ends, 

 the lower to a winged petiole, not auriculate or only obscurely 

 so ; heads loosely panicled ; involucre 5-7 mm. high ; bracts 

 subequal or 2-3-seriate, linear or linear-subulate ; rays light 

 blue. (A. patulus Lam.) N. B. to Pa., commonest north w. 

 Aug.-Oct. FIG. 963. Var. VES- 

 T-IT us Fernald. Stems densely vil- 

 lous ; leaves somewhat so beneath. 

 N. B. to Vt. 



48. A. prenanthoides Muhl. 

 Stem 1 m. or less high, corymbose- 

 panicled, hairy above in lines ; 

 leaves rough above, smooth under- 

 neath, ovate to lanceolate, sharply 

 cut-toothed in the middle, con- 

 spicuously taper-pointed, and rather 

 abruptly narrowed to a long con- 

 tracted entire portion, which is 

 abruptly dilated into a conspicu- 

 ously auricled base ; heads on short divergent pedun- 

 cles ; involucre 5-8 ram. high ; bracts narrowly linear, 

 tips recurved-spreading ; rays violet. Borders of 



streams and rich woods, w. N. E. to Va. and Ky., w. to 

 Minn, and la. Aug.-Oct. FIG. 964. 



49. A. puniceus L. Stem tall and stout, 0.5-2.5 m. 

 high, rough-hairy all over or in lines, usually purple below, 

 panicled above ; flowering branches (in well developed 

 plants) much exceeding the subtending leaves ; leaves 

 oblong-lanceolate or lanceolate, not narrowed or but 

 slightly so to the auricled base, regularly and coarsely ser- 

 rate to sparingly denticulate in the middle, rough above, 

 generally hispid on tlie midrib beneath, pointed ; heads 

 subsessile or short-pediceled ; involucre 7-12 mm. high ; 

 bracts thin, narrowly linear, attenuate, loose, subequal, in 

 about 2 rows, the outer sometimes foliaceous ; rays long 

 and showy, lilac-blue to white. Low thickets and swamps, 

 Nfd. to Man. and Ga. Aug.-Oct. FIG. 965. Var. DEM^SSUS 

 Lindl. Leaves elongate-lanceolate ; inflorescences mostly 

 shorter than the subtending leaves ; otherwise as in the 

 965. A.pnniceus. typical form. N. E. Var. COMPA.CTCS Fernald. Stout, 

 6-8 dm. high, conspicuously hispid ; leaves sub-rhomboidal, 

 irregularly toothed, harsh above ; branches of inflorescence mostly shorter than 

 the leaves. Mass, to Pa. Var. rfRMus (Nees) T. & G. Stem mostly green, 

 smooth and naked below, sparsely hirsute above ; leaves serrate, smooth beneath. 

 (Var. laevicaulis Gray.) Range of typical form. Var. LUC/DULCS Gray. The 

 very leafy stems glabrous or sparingly hispidulous ; leaves lanceolate, entire or 

 slightly denticulate, glabrous and somewhat shining ; heads usually numerous, 

 thyrsoid-paniculate ; bracts less loose and less attenuate. N. E. to Wise, and 

 111. Var. OLIGOCEPHALUS Fernald. Stem essentially glabrous ; leaves as in the 

 preceding variety ; heads few or solitary ; outer bracts often broad and folia- 

 ceous. Lab. and Nfd. to L. Superior and the White Mts. 



4. DOELLINGERIA (Nees) Gray. Pappus manifestly double, the inner of 

 long capillary bristles (some thickened at top), the outer of very short and 

 rigid bristles; bracts short, without herbaceous tips; heads corymbose or 

 solitary ; rays rather few, white, rarely rose-tinged; leaves not rigid, veiny. 



50. A. umbellatus Mill. Smooth or nearly so, leafy to the top, 0.3-2.5 m. 



