COMPOSITAE (composite FAMILY) 



815 



Aug., 



966. A. umbellatus. 



high ; leaves lanceolate., elongated., taper-pointed and tapering 

 at the base. 1-1.5 dm. long; heads very numerous in com- 

 pound flat corymbs ; bracts rather close, obtusish, scarcely 

 longer than the achenes. (Diplopappus Hook. ; Doellingeria 

 Nees.) — Moist thickets; common, especially northw 

 Sept. Fig. 966. Var. pubens Gray. 

 Lower surface of the leaves and the 

 branchlets tomentulose. — Upper Mich, 

 to Neb. and Man. 



Var. latif blius Gray. Leaves shorter, 

 ovate-lanceolate to ovate, less narrowed 

 or even rounded at base. {DipJopap- 

 pus amygdalinus Hook.; Doellingeria 

 humilis Britton.) — Pine barrens, etc., 

 N. J. , Pa. , and southw. 

 51. A. infirmus Michx. Stem slender, often flexuous, 



1 m. or less high, less leafy, bearing few or several heads 



on divAgent peduncles ; leaves obovate to ovate or 



oblong-lanceolate, narrowed at base and ciliate, the 



midrib hairy beneath ; bracts more imbricated, thicker 



and more obtuse ; rays sometimes creamy ; pappus more 



rigid. {Doellingeria Greene; Diplopappvs cornifoliiis Less.) — Open wood- 

 lands, e. Mass. to S. C. and Ala. July-Sept. Fig. 967. 



A (t^/- § ^- I^^THE Gray. Pappus less distinctly double, inner. 



_^^^n^f^^^ bristles not thickened at top, outer shorter; bracts well 



imbricated, appressed, xcithout herbaceous tips ; rays violet 

 or rarely white; achenes narrow, villous; leaves nurner- 

 ous, rigid, small, linear, 1-nerved and veinless. 



52. A. linariifblius L. Stems 1-6 . 



dm. high, several from a woody root ; JjL 



heads solitary or terminating simple 



branches, rather large (1-1.2 cm. high) ; 



leaves 2-3 cm. long, rough-margined, 



passing above into the rigid acutish 

 bracts. (Diplopappus Hook.; lonactis Greene.) — Dry 

 soil, centr. ]\^. to Wise, and southw., except in the 

 mountains. Aug.-Oct. Fig. 968. 



967. A. infirmus. 



968. A. linariifolius. 



969. A. ptarmicuiiles. 



970. A. acumluatus. 



§ 6. 0KTH6mERIS T. & G. Pap- 

 pus simple; bracts imbricated, 

 appressed, without herbaceous 

 tips, often scarious-edged or dry; 

 perennial, as all the preceding. 



53. A. ptarmicoides T. & G. 

 Smooth or roughish ; stems clus- 

 tered, 1.5-6 dm. high, simple; leaves linear-lanceolate, 

 acute, rigid, entire, tapering to the base, 1-o-uerved, with 

 rough margins, 0.5-i dm. long; heads small, in a flat 

 corymb ; bracts imbricated in 3-4 rows, short ; rays white, 

 5-8 mm. long. — Dry calcareous sod, w. N. E. and w. Que. 

 to ]\Ian., Col., and Mo. June-Sept. Fig. 969. Var. 

 LUTESCENS (Hook.'' v'^rav- Rays small, pale yellow. — 

 Englewood, 111. {Hill): Sask. 



54. A. acuminatus Michx. Somewhat hairy ; stem 

 3-9 dm. high, simple, zigzag, panicled-corymbose at the 

 sunmiit ; peduncles slender ; leaves oblong-lanceolate, con- 

 spicuously pointed, coarsely toothed above, wedge-form 

 and entire at the base ; involucral bracts ^ew and loosely 

 imbricated, linear-lanceolate, pointed, thin, 0.5-1 cm. long j 



