COMPOSITAE (COMPOSITE FAMILY) 



815 



967. A. infirmus. 



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. ; Doellingena 

 Nees.) Moist thickets; common, especially north w. Aug., 

 Sept. FIG. 966. Var. ptiBENS Gray. 

 Lower surface of the leaves and the 

 branchlets tomentulose. Upper Mich, 

 to Neb. and Man. 



Var. latif 61ius Gray. Leaves shorter, 

 ovate-lanceolate to ovate, less narrowed 

 or even rounded at base. (Diplopap- 

 pus amygdalinus Hook. ; Doellingeria 



966. A. umbellatus. humilis Britton.) Pine barrens, etc., 



N. J., Pa., and south w. 

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



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



on divergent 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. (Doellingena Greene; Diplopappus cornifolius Less.) Open wood- 

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



5. lANTHE Gray. Pappus less distinctly double, inner 

 bristles not thickened at top, outer shorter; bracts well 

 imbricated, appressed, without herbaceous tips ; rays violet 

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

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

 52. A. linariifblius L. Stems 1-6 (K*-UA K" 

 dm. high, several from a woody root; ,'*,, _ ^^ 

 heads solitary or terminating simple 

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

 968. A. linariifolius. leaves 2-3 cm. long, rough-margined, 

 passing above into the rigid acutish 

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

 soil, centr. Me. to Wise., and south w., except in the 

 mountains. Aug.-Oct. FIG. 968. 



6. ORTH6MERIS 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, 1-3-nerved, with 

 rough margins, 0.5-1 dm. long; heads small, in aflat 

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

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

 to Man., Col., and Mo. June-Sept. FIG. 969. Var. 

 LUTESCENS (Hook.) Gray. 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 

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

 spicuously pointed, coarsely toothed above, wedge-form 

 and entire at the base ; involucral bracts few and loosely 



970. A. acuminatus. imbricated, linear-lanceolate, pointed, thin, 0.5-1 cm. long ; 



A. ptarrnicoides. 



