COMPOSITAE (COMPOSITE FAMILY) 815 



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

 at the base. 1-1.5 dm. h)ng; heads very numerous in com- 

 pound flat corymbs; bracts rather close, obiu.sish, scarcely 

 longer than the achenes. (Biplopappus Hook. ; DoeUlnqerin 

 Nees.) — Moist thickets; common, especially nonhw Au-^ 

 Sept. Fig. \)m. Var. pubkns Gray. 

 Lower surface of the leaves and the 

 branchlets tomentulose. — Upper Mich, 

 to Neb. and Man. 



Var. Iatif61ius Gray. Leaves shorter, 

 ovate-lanceolate to ovate, less narrowed 

 or even rounded at base. (Diplopap- 

 pus amygdalinus Hook.; DoeUingeria 



m. 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 ohovate 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. {DoeUingeria Greene; Diplopappus cornifolius Less.) — Open wood- 

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



§ 5. IAntHE 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, 1-nerved and veinless. 

 52. A. linariifblius L. Stems 1-6 

 dm. high, several from a woody root ; 

 heads solitary or terminating simple 

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

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

 passing above into the rigid acutish 

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

 „^;i ^ 4., n,jg_ ^Q Wise, and southw., except in the 

 Aug.-Oct. Fig. 968. 



§ 6. 0RTH6mERIS T. & G. Pap- 



pus simple; bracts imbricated, 

 appressed, toithout 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 ; rnys ichite, 

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

 to Man., Col., and Mo. June-Sept. Fir,. 909. 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, coti- 

 spicuGusly pointed, coarsely toothed above, wedge-forra 

 and entire at the base ; involucral bracts few and loosely 



A. acuminfttus. imbricated, linear-lanceolate, pointed, thin, 0.6-1 cm, long ; 



soil, centr. Me, 

 mountains. 



969. A. i.iaiiiiic'oiacs. 



