Polypteris. COMPOSITE. 337 



F. tripteris, DC. 1. c. Lowest leaves commonly ovate or oblong and entire ; others of 3 

 oval or oblong or the upper linear leaflets : tips of involucral bracts and flowers usually dull 

 white: anther-tips acutish. Gray, PI. Wright, i. 121. S. Texas; first coll. by Berlandier. 

 (Adj. Mex.) 



150. POLYPTERIS, Nutt. (EtoXv'?, many, and Tn-epis, meant for TrrepoV, 

 wing ; many-winged or feathered, i. e. the pappus.) Southeastern N. American 

 herbs (entering Mexico), more or less scabrous-pubescent; with undivided and 

 mostly entire petiolate leaves, all or the upper alternate, and loosely corymbose- 

 cymose or paniculate and pedunculate heads of rose-purple or flesh-colored flowers, 

 in summer and autumn. Gen. ii. 131) ; Ell. Sk. ii. 314 (not of DC., which was 

 a Gaillardi(t) ; Nutt. Trans. Am. Phil. Soc. ser. 2, 377 ; Gray, Proc. Am. Acad. 

 xix. 30. Part of Palafoxia, Less., DC., &c. 



1. Heads homogamous, middle-sized or small : bracts of the involucre her- 

 baceous up to the small sphacelate colored tip : corollas o-parted nearly down to 

 the slender tube : akenes narrowly obpyramidal : root annual. (Nearest to Flo- 

 restina.) 



P. callosa, GRAY, 1. c. Slender, paniculately branched, a foot or two high: leaves linear, 

 slightly petioled : peduncles glandular: involucre turbinate, 10-12-flowered, quarter-inch 

 high, of 8 or 10 linear-oblong bracts : akenes minutely pubescent or glabrous : palese of the 

 pappus all short, obovate or roundish, with costate-thickened centre seldom reaching the 

 obtuse or erose and retuse apex, occasionally minute or wholly wanting. Stcv/a callosa, 

 Nutt. Jour. Acad. Philad. ii. 121; Bart. Fl. Am. Sept. t. 46. Florestina callosa, DC. Prodr. 

 v. 655. Palafoxia callosa, Torr. & Gray, Fl. ii. 369. Low or dry ground, Arkansas to 

 Texas ; first coll. by Nuttall. 



P. Texana, GRAY, 1. c. Stouter: leaves from lanceolate-linear to lanceolate-oblong (at 

 least below), distinctly petioled : peduncles less glandular : involucre eampanulate or broader, 

 20-30-flowered, 3 to 5 lines high, of 8 to 12 spatnlate-oblong bracts: palea; of the pappus 

 from oblong-ovate to oblong-lanceolate, with slender nearly complete or slightly excurrent 

 costa, sometimes almost as long as the akene, in the outer flowers often much shorter. 

 Palafoxia Texana, DC. Prodr. v. 124; Torr. & Gray, Fl. 1. c. lliver-bauks, Texas; first 

 coll. by Berlandier. (Adj. Mex.) 



2. Heads heterogamous, larger, with palmately 3-lobed rays : disk-corollas 

 parted not quite to the filiform tube : bracts of the involucre herbaceous up to 

 the small and narrow sphacelate colored tip : aketies slender : root annual. 



P. Hookeriana, GRAY, 1. c. Stouter, 1 to 4 feet high, above glandular-pubescent and 

 somewhat viscid : leaves from narrowly to broadly lanceolate, mostly 3-uerved below : invo- 

 lucre many-flowered, broad, half-inch or more high, of 12 to 10 lanceolate bracts in two 

 series, the outer looser and often wholly herbaceous, inner with purplish tips : ray-flowers 

 8 to 10, the deeply 3-cleft rose-red rays half-inch long, but sometimes reduced or abortive: 

 pappus in the ray a crown of 6 to 8 short and obtuse rather rigid spatulate palea?; in the 

 disk of narrowly lanceolate thin palero, traversed by an excurrent costa, attenuate at apex 

 into a slender point or short awn, nearly of the length of the akene. Stcvia sphacelata 

 (Nutt.). Torr. in Ann. Lye. N. Y. ii. 214. Palafoxia Texana, Hook. Ic. PI. t. 148, not DC. 

 P. Hool-n-iana, Torr. & Gray, Fl. ii. 368 ; Hook. f. Bot. Mag. t. 5549, with var. subradiata, 

 a reduced state. Sandy plains of Nebraska to Texas. (Adj. Mex.) 



3. Heads homogamous, rather large : corollas with the base of o-parted limb 

 forming a short-campanulate throat : involucre more imbricated and wliitish- 

 scarious, glabrous : akeues slender : root perennial. Polypteris, Nutt. 



P. integrifolia, NUTT. Not glandular: stems 2 to 5 feet high, fastigiatcly corymbose at 

 summit, almost glabrous : leaves scabrous, lanceolate and obtuse, upper ones linear, lowest 

 spatulate-obloug to obovate : heads fully half-inch high, mauy-flowered : principal bracts of 



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