804 



COMPOSITAE (COMPOSITE FAMILY) 



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



Aug.-Oct. FIG. 919. Extremely variable in outline of foliage, intensity of 

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

 E. S. Burgess proposes as separable species A. carmesinus, 

 A. tenebrosus, and 26 others. 



t-f tf 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 inner 

 linear, all with dark tips ; rays I 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 subumbel- 

 late clusters at the tips of the branches. 



4. A. glomeratus Bernh. Rather 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. 



920. A. furcatus. 



921. A. glomeratus. 



922. A.Schreberi. 



-- -i- Involucre slender, cylindric; bracts thin and scarious (loose and spreading 

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

 basal leaves abundant. 



5. A. Schrebdri 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 

 1 cm. long. (Including^, curvescens Burgess.) Damp 

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



* * Hays violet or blue (rarely white) ; 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 923. A. macrophyllus, 

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

 varieties include the best-marked extremes. Var. piNGuirdLius 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. vELtJTraus Burgess. Stems villous-pubescent ; leaves pilose 



