COMPOSITAE (^COMPOSITE FAMILY) 



811 



952. A. multiflorus. 



merely spreading; rays light dear blue or rarely violet. — Moist -rounds 

 e. Mass. and s. Vt. to Pa., Mo., and la., rare. Sept. Fig 961 — Perhan^ 

 a hybrid of nos. 14 and 36. ^ lernaps 



30. A. multiflbrus Ait. Pale or hoary with minute close pubescence 3-9 

 dm. high, much branched and bushy ; the heads much crowded on the spreadincr 

 racemose branches; leaves rigid, crowded, spreadintr, with rou^^h or ciliate 

 margins, the uppermost passing into the spatulate obtuse 

 hispidulous-cihate bracts; heads 5-0 mm. long- rays 

 white or rarely purplish, 10-20. —Dry sandy soil,'s. Me 

 to Ont., westw. and southw. Aug. -Oct. Fig. 952. Var' 

 ExiGuus Fernald. Heads solitary or slightly clustered 

 at the tips of slender flexuous branches. — Less common 

 /T o 1 x^^- ^- conimutatus (T. & G.) Gray. Similar; heads 



larger (7-9 mm. long); rays 20-80 (A. incanopilosus Sheldon.) — Plains 

 Minn, to Sask., westw. and southwestw. July-Oct. ' 



•♦- H- •»- Bracts glabrous, closely imbricated {the outer regularly shorter) not 

 coriaceous, imth short appressed green tips; branches slender, divaricate or 

 divergent; leaves lanceolate to subulate; heads small (4-7 mm. hiah) and 

 numerous. ^ ' 



•w Heads scattered, terminating minutely folio se slender branchlets. 



38. A. dumbsus L. Smooth or nearly so, 3-9 dm. high, the branches slender 

 loosely paniculate, divergent ; leaves linear or the upper oblong, cro\vded entire 

 with rough margins; heads rather numerous; involucre ' 

 obconical or campanulate, with 4-6 rows of linear-spatulate 

 obtuse bracts with abrupt green tips ; rays pale purple or blue, 

 larger than in no. 39. — Sandy soil, s. Me. to Ont., and southw., 

 except in the upland regions. Aug., Sept. Fig. 953. 



Var. coridifblius (Michx.) T. & G. Branchlets slender 

 and flexuous, elongated, with minute crowded divergent 

 small leaves, and generally solitary terminal heads. — i3ar- 

 rens, Mass., and southw. 



Var. strlctior T. & G. Branches stiff and ascending.— _„ 

 Mass. to Ont. and N. C. ^''•^- •^- dumosus. 



•M. ^ Heads racemosely unilateral upon very short minutely leafy branchlets. 



39. A. vimineus Lam. Smooth or smoothish, 0.5-2 ra. high, bushy, the long 

 branches almost horizontally spreading; leaves linear or narrowly lanceolate, 



elongated, the larger ones remotely serrate in the middle with 

 fine sharp teeth ; heads small, 4-0 mm. high, crowded ; bracts 



narrowly linear, acute or acutish, in 3-4 rows ; rays white. 



Moist soil, s. Me. to Ont., westw. and southw. Aug.-Oct. 

 Fig. 954. Var. roLiOL(bsus (Ait.) Gray. Leaves linear, en- 

 tire ; the ascending branches with more 

 scattered paniculate heads. — Similar 

 range. 



Var. saxAtilis Fernald. Low (1.5-6 

 954. A. vimineus. dm. high); branches and branchlets ^T 



short, ascending, leafy-bracteate, termi- 

 nated by solitary larger heads (often 1.5 cm. broad). — 

 Rocky shores, N. E. and Que. to O. 



40. A. lateriflbrus (L.) Britton. More or less pubes- 

 cent, much branched ; leaves lanceolate or oblong-lance- 

 olate, tapering or pointed at each end, sharply serrate in 

 the middle; bracts of the involucre linear, acute or rather obtuse, imbricated in 

 3-4 rows. (A. diffusus Ait.) —Thickets, fields, etc., very common from N. Sr 

 to Ont., and southw. Aug.-Oct. — Extensively variable ;' leaves larger than in 

 either of the two preceding ; the involucre intermediate between them, as to the 

 form of the bracts. Ravs mostly short, white or pale bluish-purple. Fig. 956 



955. A. lateriflorus. 



