COMPOSITAE (('OMPOSITE FAMILY) 



816 



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, oliiusish, srarcely 

 hunger than the aclienes. {Diplopappus Hook. ; Doellingeria 

 Nees.) — Moist thickets; common, especially norlhw. Aug., 

 Sept. Fjg. 966. Var. preens Gray. 

 Lower surface of the leaves and the 

 branchlets tomentulose. — Upper Mich, 

 to Neb. and Man. 



Var. latifblius Gray. Leaves shorter, 

 ovate-lanceolate to ovate, less narrowed 

 or even rounded al base. (Diplopap- 

 pus amygdalinus Hook. ; Doellingeria 

 humilis Britton.) — Pine barrens, etc., 

 N. J., I'a. , and south w. 

 51. A. inf irmus Michx. Stem slender, often flexuous, 



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



on divergent peduncles ; leaves obovate to ovate or 



vblong-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, 0. 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, oppressed, without herbaceous tips ; rays violet 

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

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



52. A. linariifftlius L. Stems 1-6 



dm. high, several from a woody root ; 



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 aoutish 

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

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

 mountains. Aug. -Oct. Fig. 968. 



§ 6. 0RTH6MERIS T. & G. Pap- 

 pus simple ; bracts imbricated, 

 oppressed, without herbaceous 

 tips, often scarious-edged or dry; 

 perennial, as all the preceding. 



53. A. ptarmicoides T. & G. gjj,, ^ ptarmicoides. 

 Smooth or roughisli ; 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^ 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. 

 i.ut£scens (Hook.) Gray. , Bays small, pale yellow.— 

 Englewood, III. (Hill); Sask. 



54. A. acuminatus Michx. Somewhat hairy ; stem 

 3-9 dm. high, simple, zigzag, panicled-oorymbose 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 



A. acuminiitua. Imbricated, linear-lanceolate, pointed, thin, 0.5-1 cm. long j 



968. A. linariifulius 



