804 



COMPOSITAE (COMPOSITE FAMILY) 



920. A. furcatus. 



(A. corymhosus Ait.) — Woodlands, s. Me. and w. Que. to L. Superior, s. to Ga. 



Aug.-Oct. Fig. 910. — P^xtremely variable in outline of foliage, intensity of 

 coloring of disk-flowers, etc., characters upon which Professor 

 E. S. Burgess proposes as separable species A. carmesinusj 

 A. tenebrosus, and 26 others. 



++ ++ Leaves thick, rough above. 



= Heads few, large (1-1.5 cm. high). 



3. A. furcatus Burgess. Stem slender, 3-6 dm. high, almost 

 uniformly leafy to the slightly forked summit; leaves ovate or 

 elliptic, acuminate, coarsely serrate, lower short-petioled and 

 slightly cordate, upper mostly sessile, often with broad-winged 

 laciniate bases; involucre of 4-5 series of pubescent pale green 

 regularly imbricated blunt bracts, the outer oblong, the innei 

 linear, all with dark tips ; rays 1 cm. or more long, narrow. 

 — Woods and rocky shaded banks, 111. and Mo. Aug.-Oct. Fig. 920. 



= = Heads smaller (hardly 1 cm. high), numerous in corymbose or subumhel 

 late clusters at the tips of the branches. 



4. A. glomeratus Bernh. Kather stout, 4.5-9 dm. high; 

 stem smooth, or pilose toward the summit ; leaves pilose 

 beneath or glabrate ; the lower broadly ovate, acuminate, long- 

 petioled ; the upper gradually smaller and narrower, on winged 

 petioles or sessile ; involucre green, broadly campanulate ; bracts 

 ciliate, dark-tipped, the inner ones slightly elongated, scarious 

 only on the margins ; rays short, rarely 0.5 cm. long. — Thick- 

 ets and wooded banks, Me. to Va. Aug., Sept. Fig. 921. 



•t- -1- Involucre slender, cylindric ; bracts thin and scarious {loose and spreading 

 ivhen dry), the innermost much exceeding the next outer series; large tufted 

 basal leaves abundant. 



5. A. Schreberi Nees. Resembling the preceding ; stem smooth or pilose ; 

 leaves thin, often pilose on the petioles and veins beneath, smooth or harsh 



above ; basal ones large, when well developed with broad 



rectangular sinuses ; involucre slightly imbricated ; rays 



-\ \ cm. long. (Including A cin*yesce«s Burgess.) — Damp 



woods and thickets, N. E. to Va. July-Sept. Fig. 922. 



921. A. glomeratus. 



922. A. Schreberi. 



* * Bays violet or blue {rarely ivhite) ; branches of the 

 infloresence glandular. 



6. A. macrophyllus L. Rather coarse, 0.3-1.5 m. 

 high, viscid- glandular at least in the inflorescence; 

 sterile tufts of large ovate cordate leaves abundant ; basal leaves large, cordate ; 

 the upper of various forms, usually smaller and narrower ; involucre generally 

 3-4-seriate ; bracts greenish, the outer short-ovate, blunt, and 

 pubescent; the inner elongated, linear, more scarious, some- 

 times roseate-tinged on the margins. — An extremely variable 

 plant, from which several forms are separated, by some 

 authors, as species. — The typical plant is simple, 3-9 dm. 

 high, characterized by thick harsh foliage, stout rather 

 smooth stem, and broad terminal corymbose inflorescence 

 with many conspicuous stipitate glands. (Including A. ros- 

 cidus, etc.. Burgess.) — Open woods and thickets, N. B. to 

 Minn, and N. C. Aug., Sept. Fig. 923. The following 

 varieties include the best-marked extremes. Var. pingdif6lius Burgess. Stem 

 glabrous, 5-6 dm. high ; many of the basal leaves very smooth (almost greasy). 

 others scabrous at least in spots. — Me. to N. Y. and westw. Var. excelsior 

 Burgess. Stem smoothish, 1 m. or so high, glaucous ; leaves pale, for the most 

 part narrowly ovate, oblong, or lanceolate ; bracts elongated. — N. H. to Ont. 

 and Mich. Var. vELtxiNus Burgess. Stems villous-pubescent ; leaves pilose 



923. A. macrophyllus. 



