810 



COMPOSITAE (COMPOSITE FAMILY) 



947. A. concinnus. 



94S. A. polyphyllus. 



the last ; leaves lanceolate or linear, the lower usually long and narrow. 

 (A. purpuratus Nees. ) Va., W. Va., and southw. Sept., Oct. FIG. 946. 



31. A. concinnus Willd. Not glaucous, slender, 3-9 dm. 

 high ; leaves lanceolate, mostly somewhat serrate, the lowest 

 spatulate-lanceolate on winged petioles ; heads smaller than in 

 no. 29, numerous, panicled; bracts of involucre loose, with 

 more herbaceous narrower green tips; rays violet. Rocky 

 woods, rare, Ct., and southw. Aug., Sept. An ambiguous 

 species. FIG. 947. 



** ++ Rays white, rarely purplish ; bracts narrow, subulately 

 green-tipped; leaves mostly narrow, narrowed at base, on 

 the branchlets lax and attenuate. 



32. A. polyphyllus Willd. Low or tall, 1-15 dm. high, with 

 virgate branches; cauline leaves lanceolate or linear, 0.5-1 dm. 



long ; heads paniculate ; bracts lanceolate-subulate, the outer- 

 most much shorter; rays 1 cm. long. (A. Faxoni Porter). 

 Rocky or gravelly soil, e. Me. and u. Vt. to Ont., Wise., and 

 southw. Aug.-Oct. FIG. 948. Heads larger than in the 

 next. 



33. A. ericoides L. Smooth, 3-9 dm. high ; the simple 

 branchlets or peduncles racemose along the upper side of the 

 wand-like spreading branches ; lowest leaves oblong-spatulate, 

 sometimes toothed ; the others linear-lanceolate or linear-awl- 

 shaped ; heads 6mm. high or less' involucre hemispheric, or 

 campanulate; bracts often nearly equal, with attenuate or 

 aid-shaped green tips. Diy open places, N. E. to Ont. , 

 Minn., and southw. Aug.-Oct. FIG. 949. Var. viLL6scs 

 T. & G. Similar, but the stem and generally the narrow leaves 



villous-hirsute. (Var. pilosus Porter.) Same range. Var. 



PRfxGLEi Gray. A low slender northern form, with few erect 



branches and rather small scattered mostly solitary heads. 



(A. Pnnglei Britton.) Me. to Ont., s. to Mass, and Wise. 

 Var. platyphyllus T. & G. Stout; stem and branches 



densely white-villous ; leaves lanceolate or oblong-lanceolate, 



mostly pubescent ; heads as in the typical form, but larger. 



O. to Mich., 111., and southw. 



34. A. depauperatus (Porter) Fernald. 



1-4 dm. high ; basal leaves small, spatulate ; 



stem-leaves linear, those of the branches 



linear-subulate ; heads small, 45 mm. high, 

 terminating the slender divaricate branches ; involucre tur- 

 binate, 2-3 mm. broad, of about 20 linear-subulate bracts, 

 these less rigid than those of the preceding species. (A 

 ericoides, var. pusillus Gray, and var. depauperatus Porter.) 

 Serpentine barrens, s. Pa. and adjacent W. Va. July- 

 aept. FIG. 950. 



Var. parviceps (Burgess) Fernald Stout pilose 3-7 

 dm. high ; leaves linear or lanceolate ; heads rather crowded. 



(A. ericoides, var. Burgess.) Prairies and woods, 111. 

 and Mo. 



t- - Hoary-pubescent or hirsute ; herbaceous tips of the 

 more or less bristly-ciliate involucral bracts squarrose 

 or spreading; cauline leaves small, linear, entire, 

 scarcely narrowed at the sessile or partly clasping base; 

 heads numerous, small, racemose. 



35. A. amethystinus Nutt. Tall (0.5-1.5 m. high), up- 

 right, much branched, puberulent or somewhat hirsute ; 

 Ml. A. amethystinus. leaves not rigid; heads 6 mm. high ; the tips of the bracts 



Slender, glabrous, 



949. A. ericoides. 



A depauperatus . 



