Thalictrum. RANUNCULACE.E. 39 



3, t. 2. T. pubescens, Pursh ! I. c. T. revolutum ! &, T. corynellum, 

 DC. prodr. 1. p. 12. T. polygainurn, JMiiht. ! cat. ed. 2. p. 56. T. ru^o- 

 suin, Ail. Ki'W. {ed. 1.) 1. p. 2G2. T. purpurascons, Pitrsh ! in herb. Bart. 

 T. rugo.suiu & Cumuli, JJurlingt. ! Ji. (.'est. p. '.V3L 



Banks of rivers and in wet meadows, Canada (lat. 5G ) to Georgia; 

 Western States! June-July. — Stem 3-6 ft-et liigh, branching. Leaves very- 

 large, always sessile ; divisions of the petiole elongated. Leaflets variable 

 in size, form, and pubescence, ovate, elliptical, or roundish ; often cordate at 

 the base, but sometimes cuneifonn ; the veins scarcely prominent, or eleva- 

 ted and rugose ; margin commonly revolute. Panicle compound. Sepals 

 white, oblong, small. Filaments more or less clavate ; anthers somethaes 

 linear-oblong and slightly pointed. Carpels glabrous, about o lines long. 



• -^ 5. 7'. alpinum (Linn.): Mowers perfect, in a simple raceme, nodding; 

 filaments tiliform ; anthers oblong-linear ; stem simple, nearly naked ; leaves 

 biternate; leaflets glabrous ; stigma linear; carpels ovate, sessile. — Linn. sp. 

 p. 767 ; DC. si/st. 1. p. 175. 



Canada, Kabn ; Island of Anticosti, Pursh! (v.s. in herb. Shepherd); 

 Newfoundland, Banks ; Greenland, Hornemann.—^Piant scarcely a span 

 high. Leaves mostly radical, petiolate ; leaflets about one-third of an inch 

 Jong, roundish, subcoriaceous, crenately toothed. Stem scapiform. Raceme 

 6-10-tiowered : pedicels slender. Sepals 4, oblong. Ovaries few : styles 

 almost wanting : stigmas thick and pubescent. — The American plant exactly 

 resembles our specimens of T. alpinum from the North of Europe. 



*** Sepals petaloid, not caducmis, longer than the stamens : root grumous. 



./ 6. T. anemonoides (Michx.) : root fasciculately tuberous ; flowers few, 

 umbellate ; floral leaves involucriform ; radical ones biternate. — Michx. ! fi. 

 I. p. 322; DC. prodr. I. p. 15; Hook.Jl. Bar. -Am. 1. ^. 4 ; Juss. ami.vms. 

 3. p. 249. t.2\. f. 2 ; Darlingt. ! ji. Cest. p. 333. Anemone thalictroides, 

 Linn.; Pursh, Ji. 2. p. 387; Bart. Ji. Am. Sept. 2. t. 44 ; Bot. mag. t. 

 866. 



Canada! to N. Carolina !&. Western States ! April-May. — Root composed 

 of 4-6 clavate tubers. Radical leaves on long petioles : cauline leaves 1-3, 

 sessile, trifoliolate, verticillate ; leaflets petiolulate, roundish, obtusely 3-5-lob- 

 ed. Stems 4-8 inches high, commonly several from one root. Peduncles 

 3-6, one-flowered, 1-2 inches long. Flowers nearly an inch in diameter. Se- 

 pals 6-10, elliptical, white, sometimes slightly tinged with purple. Fila- 

 ments filiform, or somewhat clavate: anthers oblong. Ovaries 6-10: style 

 none: stigma simple. Carpels oblong, acute, prominently ribbed, substipitate. 

 — "Habit and frondescence of Isopyrum, with the inflorescence of Ane- 

 mone, and the fruit of Thalictrum." DC. 



In the herbarium of the late Rev. L. D. von Schweinitz are specimens of a Tha- 

 lictrum, which may be distinct from any of the preceding ; but for want of the fruit, 

 it is here recorded only as a provisional species. 



7. T. 7wrZi^«(iZc (Schwein. mss.) : flowers perfect (or polygamous 1) ; filaments 

 somewhat clavate ; anthers oblong, obtuse ; leaf solitary, radical, on a long petiole, 

 biternate, leaflets membranaceous, roundish, obtusely lobed, subcordatc; stem slen- 

 der, nearly naked (tall), the summit a little branched, and bearing several 3-foliolate 

 leaves and a small few- (4-8) flowered panicle ; stigma simple, sessile. 



On rocks, Patrick county, Virginia, and on the Yadkin River, North Carolina, 

 Schweinitz ! — Stem 2 feet high. Leaflets glabrous, about three-fourths of an inch 

 long. Cauline leaves at the summit of the stem, very small. Panicle as long as the 

 leaves. Flowers very small. Sepals 4-5, greenish, oblong. Ovaries 4-6, subses- 

 sile, ovate, acute, pointed with the small simple stigma. 



