COMfOSITAE (composite FAMILY) 



803 



Annual ; Involucre 6-S mm. liigh, of linear- subulate loosely 



imbricated bracts 57. A, subulatus, 



g. Leaves on bi-anclilets broader k. 



h. Inflorescence loosely paniculato-corymbose. 



Bracts thin, uniform, Hnoar-lanceolate ; rays few, while or 



pinkish, rarely wantlajf 51. A. acuminatus. 



iSracts tinti, oblonig:, the tips foliaceoua ; rays numerous, 



violet ]], A.radula, 



h. luflorescence definitely paniculate i. 



i. Bracts ascending,' their tips not squarrose. 



Brads regularly imbricated in several series. 



IJracts linear-attenuate 42. A. paniculaUiS. 



Bracts broad-linear or linear-oblong-, with conspicuous 



elliptic or subrhombic green tips . , . . 43. -<4. salicifoliua. 



Bracts subequal 45. ^. longifolius. 



i. Bracts with spreading or squarrose tips, the outer mostly 



foliaceous ... 46, ^. novi-belgii. 



d. Stem conspicuously pubescent j. 

 j. Bracts with definite firm subulate tips. 



Involucre hemispherical or campanulate, as broad as high ; leaves 



lanceolate to oblong-lanceolate . . (38) A. ericoides^ v. platyphyllua. 



Involucre turbinate, narrower than high (34) A. depauperatus, v, parviceps. 



j. Bracts \\ithout firm subulate tips. 



Heads solitary or loosely paniculate-corymbose ; bracts thin, linear- 

 lanceolate, loosely imbricated ; rays whitish, violet, or rose-pink. 

 Leaves essentially njiiform and crowded on the stem, entire or 



slightly toothed, blunt or acutish .... . 55. ^4. nemoraUa. 



Upper leaves largest, coarsely toothed, long-acuminate . . 54. ^. acv/minatua. 

 Heads paniculate or racemose ; bracts rather closely imbricated. 

 Bracts regularly imbricated in several series; rays short, white 

 to lavender. 

 Heads regularly paniculate; bracts linear-attenuate; leaves 



lanceolate (42) A. paniculatus, vars. 



Heads in more or less 1-sided racemes ; bracts generally with 



colored dilated midribs ; leaves lanceolate to oblong . . 40. A.lat&rifiorus. 

 Bracts subequal ; rays long, blue or violet ; stem densely villous 



(45) A. longifoliu8, v. ■villieavli.y. 



§ 1, HELEASTRUM (DC.) B. & H. Pappus simple^ coarse and rigid, the 

 stronger hnstles somewhat clavate ; bracts rigid, more or less foliaceous, 

 nearly eq 



1. A. paludbsus Ait. Stems 3-7 dm. high, glabrous or nearly so; heads 

 rather few, racemose or spicate ; involucre 1 cm. high ; outer 'bracts lax, foli- 

 aceous ; rays purple ; leaves linear, entire. — Kan. to Tex., 

 N. C, andGa. Fig. 918. 



§ 2. BI6tIA (DC.) T. & G. Involucre ohovoid-hell- 

 shaped, turbinate, or cylindric; the bracts regularly 

 imbricated in several rows, appressed, nearly destitute 

 of herbaceous tips ; rays 6-18 ; achenes slender ; pap- 

 pus slightly rigid^ simple; lower leaves heart-shaped, 

 petioled, coarsely serrate; heads in open corymbs 

 {rarely congested). 



* Bays white {sometimes colored in age) ; 

 branches of inflorescence xoithout glands. 



^ Involucre ovoid-bell-shaped or turbinate; plants simple^ 

 rarely producing large tufted basal leaves. 



*+ Leaves thin, smooth or sparsely hairy but not rough. 



2. A. divaricatus L. Stem slender, somewhat zigzag, 3-9 

 dm. high, glabrous or sparingly pilose ; leaves coarsely and 

 unequally serrate loith sharp spreading teeth, taper-pointed, 

 ovate, ovate-lanceolate, or deltoid-ovate, all but the upper- 

 most heart-shaped at the base and on slender naked petioles ; 

 involucre 6-8 mm. high ; bracts thin, scarious, mostly obtuse 

 and ciliate, with inconspicuous green tips, the outer short and 

 oblong or oblong-triangular, the inner linear ; rays 0-12. 919. A. divaricatus 



9 IS. A. paludosus. 



