812 



COMPOSITAE (composite FAMILY) 



Var. GLOMEKELLus (T. & G.) Burgess. Simple or subsimple ; leaves oblong- 

 lanceolate, hLspidulous ; inflorescences small and axillary, or short, terminal, 

 and spicate. — N. Y. to (). and 8. C. 



Var. hirsuticaulis (Lindl.) Porter. Slender; the stem and the midveins of 

 the elongated lanceolate leaves generally villous or hirsute ; branches slender, 

 spreading or ascending, simple. (A. hirsuticaulis Lindl.) — Mostly in low 

 woods and thickets, N. B. to Mich, and Ky. 



Var. bifrons (Gray) Fernald. A luxuriant form, with large thin leaves 

 (1-1.5 dm. long, 2.5-4 cm. wide), and rather larger heads loosely disposed on 

 the spreading branches. (A. diffiisus, var. Gray ; A. laterijloints, var. yraiuUs 

 Porter.) — N. Y. to S. C, Mo., and Mimi. 



Var. thyrsoideus (Gray) Sheldon. Cinereous-pubescent or glabrate, with 

 ovate-oblong to lanceolate leaves, the branches ascending and often short, and 

 the thyrsoid or spicate-glomerate heads less secund. {A. missouriensis Britton.) 



— N. E. to Ont., Mo., and Tenn. 



^_ ^_ ^_ ^_ Involucre various; the heads lohen numerous densely or loosely 



paniculate on erect or ascending branches. 



■M. Cauline leaves sessile, but the base not conspicuously cordate nor auriculate, 



nor contracted to a winged petiole. 



= Heads small or middle-sized ; bracts narrow, in several lengths, the erect 



green tips not dilated. 



41. A. Tradescanti L. Stem much branched, 0.5-1.5 m, high ; the numerous 

 heads (1-1.5 cm. broad) somewhat panicled or racemed ; leaves lanceolate to 



linear, 5-15 cm. long, tapering to a long slender point ; the 

 lower somewhat serrate in the middle ; involucre 3-5 mm. 

 long; its bracts linear, acutish, partly green down the back; 

 rays short and narrow, white or purplish. — Low grounds, Me. 

 to Ont. and Minn., s. to Va. and Mo. Aug. -Oct. Fig. 956. — 

 Some forms approach no. 39, others differ from A. paniculatus 

 only in the smaller heads and shorter rays. 



42. A. paniculatus Lam. Stem smoothish, 0.5-2.5 m. high, 

 much branched ; the branches and scattered heads (about 2 cm. 

 broad) loosely paniculate ; leaves elongate-oblong to narrowly 

 lanceolate, pointed, somewhat serrate or entire ; the cauline 

 956. A. Tradescanti. 0.5-1.5 dm. long, about 1 cm. wide; involucre 8 mm. long; 



its bracts narrowly linear^ ivith attenuate green tips, or the 

 outermost wholly green ; rays white or purplish, 6-8 mm. long. — Wet meadows, 

 thickets, etc., throughout. Aug.-Oct. Fig. 957. — Approaches in its different 

 forms the preceding and the three following species. Var. 

 lanXtus Fernald. Stems densely white-villous or lanate. 



— L. Willoughby, Vt., to L. Winnipeg. Var. .belli di- 

 FLoRus (Willd.) Burgess. Leaves linear or narrow-lance- 

 olate, mostly entire ; branches ascending, with numerous 

 clustered heads. — Throughout the range. Var. s/mplex 

 (Willd.) Burgess. Leaves large and thin, oblong-lance- 

 olate to oblanceolate, the cauline 1-2 dm. long, 2-4 cm. 

 wide, entire or slightly serrate ; heads scattered in leafy 

 panicles. — N. H. to Neb. and Va. Var. ACtiTiDENS Burgess. 

 Leaves as in the preceding variety, but conspicuously and 

 coarsely serrate ; brawches short, usually shorter than or 

 little exceeding the subtending leaves. — Me. to 111., Kan., 

 and Ky. Var. cinekascens Fernald. Stem closely 

 cinereous-puberulent ; leaves dull green, scabrous above, 

 lanceolate, with slightly cla.sping bases, subentire. — Me. 

 to Ma.ss. and Vt., local. 



43. A. salicifolius Ait. Similar to no. 42 ; the leaves commonly shorter, 

 Jirmer, often scahrous, mostly entire ; involucre more imbricated, the firmei 

 lirlear or linear-oblong bracts with shorter acute or obtusish green tips; heads as 



957. A. jianiculatus. 



