814 



COMPOSITAE (COMPOSITE FAMILY^ 



tardiflorus. 



964. A, prenanthoides. 



++ ++ Cauline leaves (at least the lowest) conspicuously contracted into a winged 

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



47. A. tardifldrus 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 northw. 

 Aug.-Oct. Fig. 963. Var. ves- 

 TiTus 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 mm. 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 the 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. toMan.and Ga. Aug.-Oct. Fig. 965. Var. DEMfssus 

 Lindl. Leaves elongate-lanceolate ; inflorescences mostly 

 shorter than the subtending leaves ; otherwise as in the 

 typical form. — N. E. Var. compActds Fernald. Stout, 

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

 harsh above ; branches of inflorescence mostly shorter than 

 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. LUcfDULus 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. 



I 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. 



965. A. puniceus. 



irregularly toothed, 

 the leaves. — Mass. 



