806 



COMPOSITAE (COMPOSITE FAMILY) 



>. A. radula. 



oeined, closely sessile, 5-8 cm. long, nearly uniform ; heads 1-40 ; bracts of bell- 

 shaped involucre oblong, obtuse, oppressed, clearly in several series, with very 

 short and slightly spreading herbaceous ciliate tips; rays pale 

 violet ; achenes smooth. Bogs and low woods, Nfd. to Del. and 

 w. Va. July-Sept. FIG. 928. 



Var. strictus (Pursh) Gray. Slender, 1-8 dm. high ; heads 

 1-8 ; iuvolucral bracts more foliaceous, acute or acutish, nearly 

 equal. (Var. biflorus Porter.) Damp rocky or mossy places, 

 n. Lab. and Hudson B. to Nfd., N. B., and n. N. E. 



* * Involucre and usually the branchlets viscid- or pruinose- 

 glandular, well imbricated or loose; pubescence not silky ; 

 leaves entire (or the lower with few teeth), the cauline all 

 sessile or clasping ; rays shoiry, violet to purple ; involucral 

 bracts spreading, infeio or many ranks. 



12. A. grandiflbrus L. Minutely 

 hispid; stems slender, loosely much 

 branched, 3-9 dm. high ; leaves very small (0.5-4 cm. 

 long), oblong-linear, obtuse, rigid, the uppermost 

 passing into bracts of the hemispherical squarrose 

 many-ranked involucre ; rays bright violet, 2.5 cm. 

 long; achenes hairy. Dry open places, Va., and 

 southw. Heads large and very showy. FIG. 929. 



13. A. oblongifolius Nutt. Minutely glandular- 

 puberulent, much branched above, rigid, paniculate- 

 corymbose, 3-7 dm. high ; leaves narrowly oblong or 

 lanceolate, mucronate-pointed, partly clasping, thick- 

 ish, 2.6-5 cm. long, 0.5-1 cm. wide ; involucral bracts 



nearly equal, broadly linear, appressed at the base ; rays 

 violet-purple; achenes canescent. Bluffs and rocky banks, 

 Pa. and Va. to Minn, and Kan. Sept, Oct. Heads middle- 

 sized or smaller. FIG. 930. 



Var. rigldulus Gray. Low, rarely more than 3 dm. high, 

 with more rigid and hispidulous-scabrous leaves. (A. Kum- 

 leini Fries.) More exposed situations, 111., Wise., and 

 southwestw. Late July-Oct. 



14. A. n&vae-dngliae L. Stem stout, hairy, 0.5-2.5 m. 

 high, corymbed at the summit ; leaves numerous, lanceolate, 

 entire, acute, auriculate-clasping, 

 980. A. oblongifolius. clothed with minute pubescence, 0.5- 

 1 dm. long ; bracts nearly equal, 

 linear-awl-shaped, loose, glandular-viscid, as well as 

 the branchlets ; rays violet-purple, rarely white, very 

 numerous ; achenes hairy. Moist chiefly calcareous 

 grounds, centr. Me. to w. Que., westw. and southw. 

 Aug.-Oct. Heads large ; a very handsome species, 

 popular in cultivation. (Escaped 

 from gardens, and locally natu- 

 ralized in Eu.) FIG. 931. Var. 

 ROSE us (Desf.) DC. Rays pink 

 or rose-color. Range of the typ- 

 ical form, local. 



15. A. mode'stus Lindl. Pu- 

 bescent or glabrate ; stem slender, 



929. A. grandiflorns. 



931. A. novae-angliae. 



simple, with few large heads terminating slender branch- 

 lets ; leaves lanceolate, very acute, narrowed to a sessih 

 base, sparingly serrate or serrulate ; bracts linear-attenuate, 

 equal, mostly herbaceous ; rays dark violet. (A. major 

 Porter.) Rich soil, w. Ont. and n. Minn, to B. C. and 

 982. A. modestus. Ore. July-Sept. FlG. 932. 



