810 



COMPOSITAE (COMPOSITE FAMILY) 



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



{A. purpuratus Nees. ) Va., W. Va., and south w. 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. 



w. -4-*- Hays white, rarely purplish; bracts narrow, subulately 

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

 the branchlets lax and attenuate. 



947. A. concinnus. 



948. A. polyphyllus. 



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 n. 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 6 mm. high or less; involucre hemispheric or 

 campanulate ; bracts often nearly equal, with attentuate or 

 awl-shaped green tips. Dry open places, N. E. to Ont. , 

 Minn., and southw. Aug.-Oct. FIG. 949. Var. viLL6sus 

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



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

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

 branches and rather small scattered mostly solitary heads. 

 (A. Pringlei 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, 4-5 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- 

 Sept. FIG. 950. 



(Burgess) Fernald Stout pilose 3-7 950> A depauitt ,, ltus . 

 near or lanceolate ; heads rather crowded. 

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

 and Mo. 



H- - Hoary -pubescent or hirsute; hert>a<-eims tips of the 

 more or less !>risth/-ciliate in mineral hraets si/i<arr<>se 

 or spreading ; canlinc /fares srn<r/L linear, entire, 

 scarcely narrowed at the .sv.x-.s-/7r or part hi e/aspi(/ !>ase; 

 heads nnnnrons. small. racemose. 



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

 right, much branched, puberulent or somewhat hirsute ; 

 951. A. amethystinus. leaves u<>t rigid ; heads 6 mm. high ; the tips of the bracts 



Slender, glabrous, 



949. A. ericoides. 



Var. parviceps 

 dm. high ; leaves li 



