ThaUclrwn. RAXrNCULACK.E. 17 



T. poiygamum, Mi hl. Stem tall. iiiDstlv {^reen, glabrouB, nut manifoslly glandular: loaf- 

 Iits sometimes minutely anil sparsely jnibeseent heueatb (the Iiairs Himi)lo ami jianeieeliuLir) : 

 panielcs naked and mostly eorymbosc: iiuwers polygamous, developed toward midnnmnier, 

 more corymbosely clustered than in tiie following: .sepals and stamens mostly white; tiie 

 latter comparatively short, ere<t. with strongly elavate and rugulose filani'iits broader than 

 the oval or obloug pointless (or rarely apiculatc) anthers. — Cat. 54 (1813), & ed. 2, .">(; 

 (1818), with eliar. " smootl), ]ioli/i/amoiis." T. jmbesans, J'ursh, Fl. ii. .'188, by part of char, 

 but not as to pubescence. T. cori/iielhim, DC. Syst. i. 172; Leeoyer, 1. <•. 143. T. Comuii, 

 Hook. Fl. Bor.-Am. i. 3, partly (var. fi) ; Torr. & Gray, Fl. i. 38." T. Cormiii, Cray, Man. 

 eds. 1-5, not L., of which see below. T. leiicoshmon, Koch & Bouclie, Ind. Sem'. II. .rt. 

 Berol. 1854; \Valp.^\nn. iv. 12. — Low or wet grounds, New Brunswick and Lower Can- 

 ada to upper parts of Carolina and Florida; at the north liowering in July anil Aug. 

 There are male plants with sterile ovaries, and female witii some i)olliniferuus staniens. 

 A variety (f.om N. New York to mountains of Carolina) lias akenes ratlier conspicuouslv 

 stipitate. 



Var.* macrostylum, Rohin.sox, n. var. Very slender: leaflets small, subentire: 

 llouer.s nearly dia-cious, the fertile ie.ss numerous and in a more spreading panicle than in 

 the typical form : heads of akenes small, dense, and spherical. — T. Cornuti, var. brerifoliuin, 

 Siuittleworth in herl). I\ Coimiti, var. murrosti/him, Shuttleworth in distr. Rugel. 7'. 

 7n(irrosti/lum, Small & Heller, Mem. Torr. Club, iii. 8. — Mountains of North Carolina to 

 Georgia, Riif/cl, Smnll & Heller. A well marked variety, but passing into the type. 



T. purpurascens, L. Stem 2 to 4 feet high or taller, often purplish : leaflets mostly 

 oblong or oblong-cuneate, more veiny and reticulated, beneath with or without some glaml- 

 less or gland-tipped minute hairs or with waxy atoms: panicles loose and more pyramidal : 

 flowers nearly dia'cions (rarely with a few imperfect anthers to the female flowers) : sepals 

 usually gi'cenish or purplish : fllaments wliite or pur])lis!i, cajiillary, yet occasionally clavel- 

 late at summit, soon drooping : anthers linear or oblong-linear, nmcronate or mucromilate. 

 — Spec. i. 546, & ed. 2, i. 769 (T. Viniiniannm elatius (jlaucuin, Morison) ; tiray, .Man. 

 ed. 3, 39. T. piirpurascena, & T. rugomm (not Ait.), Pursh, 1. c. 388, 389 ; Spreug. I'ugill. i. 38. 

 T. pubescciis, Pursh, 1. c. 388, in jjart. T. ptir/naascens, & T. revohttiim, & partly T. Carolini- 

 anum, DC. Syst. i. 174. 7'. Conmti, Hook. Fl. Bor.-Am. i. 3,t. 2 (var. a), &c. T. daa.irarpum, 

 Fisch. & Lall. Ind. Sem. Hort. Petrop. 1841, 72 ; Walp. Hep. i. 13 ; Leeoyer, 1. c. 145, form 

 with akenes sparsely pubescent, and some of its ribs not rarely interrupted or branching. 

 T. revoliitiim, Leeoyer, 1. c. 146, tiie form with lower face of leaves and simietimes other 

 parts copiou.sly glandular, the ghmds or waxy atoms some .surmounting short hairs, some 

 sessile. This is T. imrfnintsrens, var. cerij'eriim, C. F. Austin in Gray, Man. ed. 5, 39; but 

 all the varieties freely run together. Muhlenberg, F"l. Lancast. ms.. well described the 

 species under the name of T. rjmveolciis, on account of the heavy scent, which is greater- in 

 the more glandular form. — On drier ground, Canada and Saskatchewan to Florida, Texas, 

 New Mexico, and Arizcma ; fl. spring and earliest summer. 



T.* COriaceum, Sm.u.l. Dicecious, 3 to 6 feet high : roots of stout bright yellow fibres : the 

 short petioles niucli dilateil : leaflets obovate or suhorl)icular in outline and creiiate-toothed 

 or lobed nearly as in the following, pale beneath, thickish for the genus but scarcely at all 

 coriaceous: akenes more or less strongly .stipitate. — Mem. Torr. ('lub, iv. 98. T.dioinim, 

 var. coriaceum, Britton, Bull. Torr. Club, xviii. 363. — Mountains of Southwestern Virginia 

 and North (Carolina, Porter, Small, Heller. 



++•»-* Comparatively low, wholly dinecious, and the fewer cauline leaves slender-petioled : 

 leaflets with rounded and pointless lobes or teeth : akenes small (le.ss than 2 lines long), 

 completely terete and with equal ribs ; the stigma or style deciduous. 



T. dioicum, L. Fibrou.'s-rooted, glaucous or pale : stem a foot or two high, only 2-3-leaTed : 

 leaves thrice or lowest four times ternate ; leaflets mostly slender-petiolnlate and drooping, 

 roundish and snbcordate : panicles rather small and pedicels umbelhite : flowers greenish m itb 

 dull purplish tinge ; the male drooping, with capillary filaments little longer than the linoar 

 fuscous mucronate anthers : carjiels 5 to 13 : linear stigma occupying the whole length »>f 

 the .style and broader, much longer than the ovary : akenes strongly 10-12-costate. — Spec, 

 i. 545: Torr. & Grav, Fl. i. 3S; Meehan. Native Flowers, i. 45, t. 12. T. hmtjntum. Michx. 

 ri. i. .122. T. Cnn.liui'nuim, Hose in DC. Sv.st. i. 174, excl. v;.r —W, ..,!..! l,;n..l,I... \.u- 



