COMPOSITAE (COMPOSITE FAMILY) 



815 



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. Aug., 



Sept. FIG. 966. Var. PUBENS 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. ; 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. (Doellingeria 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, l-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. linadifolius. 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. 



967. A. inflrmus. 



A ptarmlcoides . 



970. A. acuminatus. 



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 a flat 

 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 

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



