Thalictrum. RANUNCULACE.E. 15 



akenes very few, oblong, slight!}' aucipital, subulate-tipped. — Spec. i. 545 ; Lightf. Fl. 

 Scot. i. t. 13; Fl. Dan. t. 11 ; Siniy, But. Mag. t. 2237 ; Torr. & Gray, Fl. i. 39; Wats. Bot. 

 King Exp. 4. — Newfoundland and Anticosti, arctic Alaska, mountains of N. Nevada, and 

 alpine region of Rocky Mountains to Colorado.^ (Greenland, Eu., N. Asia.) 



* * Flowers lierniapiirodite, iu loose panicles on leafy stem : sepals caducous, greenish : 

 filaments capillary and weak : anthers linear : akenes terete, tipped with oval stigma. 



T. minus, L., var. Kemense, Trelease. Stem l to 3 feet high, sulcate-striate : leaves 

 thrice ternate : fruiting pedicels filiform : carpels few. — Proc. Bost. Soc. Nat. Hist, xxiii. 

 300. T. Kemense, Fries, Fl. Hallaud, 94 ; Ledeb. Fl. Ross. i. 13 ; Regel, Bull. Soc. Nat. 

 Mosc. 1861, pt. 2, 36, t. 3. T. minus, var. elatum, Lecoyer, 1. c. 283, in part. — Unalaska. 

 (Adj. N. E. Asia, N. Eu.) 



* * * Flowers hermaphrodite, not very numerous, pauicled on leafy stem, slender-pedi- 

 celled : sepals tardily deciduous, white or whitish : filaments clavate, erect : anthers oval or 

 short-oblong, pointless : akenes compressed, gibbous, one edge either straight or concave, 

 thin-walled, not filled by the seed, the sides with few nerves or veins. 



-f— Akenes slender-stipitate, dorsally gibbous, the ventral edge concave at maturity, apicu- 

 late with very short style or stigma. 



T. clavatuna, DC. Stems slender, 1-2-leaved : leaves biternate : leaflets membranaceous, 

 large, roundish, very obtusely lobed : flowers loosely cymose : filaments bright white, the 

 petaloid-dilated summit quite as wide as the oval anther : akenes somewhat lunate-oblong, 

 almost equalled by the filiform stipe. — Syst. i. 171; Deless. Ic. Sel. i. t. 6; Gray, Am. 

 Jour. Sci. xlii. 17, & Man. 39. T.Ji/ipes, Torr. & Gray, Fl. i. 38. T. tiudicaule, Schweinitz 

 in Torr. & Gray, Fl. i. 39. — Wet soil on mountains, Virginia "-^ to Alabama and Georgia ; 

 first coU. by Michaux, hut not published. 



^_ ^^ Akenes short-stipitate, veutrally very gibbous, tipped with subulate long stigmatose 

 style. 



T. sparsiflorum, Turcz. Stem a foot to a yard high, striate-angled, leafy to the top : 

 leaves twice or thrice ternate or quinate, upper gradually diminished and sessile : leaflets 

 rather small, often pulverulent-glandular beneath : flowers sparse and narrowly paniculate : 

 filaments filiform with narrowly clavate summit, much longer than the often glandular- 

 puberulent ovaries : akenes half rhombic-ovate (a line and a half wide), very flat, the dorsal 

 edge straight. — Turcz. in Fisch. & Meyer, Ind. Sem. Petrop. i. 40 (1835) ; Regel, 1. c. t. 1 ; 

 Gray, PL Wright, ii. 8 ; Wats. 1. c. 4 ; Lecoyer, 1. c. 1 55. T. clavatum. Hook. Fl. Bor.-Am. 

 i. 2 ; Torr. & Gray, 1. c. 37, not DC. — Moist grounds, Hudson Bay district, from lat. 57° 

 to the Aleutian Islands, and southward in the Rocky Mountains to Colorado, in the Sierra 

 Madre to San Bernardino Co., Calif. (N. Asia.) 



* * * * Flowers dioecious, in two species polygamo-dioecious, paniculate on a leafy stem : 

 sepals whitish, greeni,sh, or dull purplish, early deciduous : stigmatose style slender-sub- 

 ulate and more or less persistent ; akenes either sessile or short-stipitate, moderately or 

 sometimes not at all gibbous. 



-1— Western species : akenes compressed but more or less tumid, manifestly aucipital, thin- 

 walled (except in T. venulosum) : filaments all capillary and weak: anthers linear, mucro- 

 nate or apiculate : leaves 2-3- or lowest 4-teruately compound, or last divisions quinate, at 

 least the lower cauline petioled: leaflets (as in all our species) obovate or rounded, or 

 cuneate at base, or subcordate. 

 T. Fendleri, Engelm. A foot to a yard high, with 3 to 5 cauline leaves ; upper ones short- 

 petioled or sessile : leaflets of rather firm texture, commonly half inch long, with lobes 

 rounded or sometimes mucronate acuminate : carpels either numerous or few in the head ; 

 akenes ovate or oblong-ovate, 2 or 3 lines long, moderately oblique, the ventral edge more 

 gibbous, each face mostly 3-nerved or ribbed, the central rib more salient, and the lateral 

 sometimes branched ; seed linear-oblong or elongated-oblong. — Engelm. in Gray, PI. Fendl. 

 5, & PI. Wright, ii. 7 ; Wats. Proc. Am. Acad. xiv. 289 ; Lecoyer, 1. c. 134. — Mountains of 

 W. Texas, New Mexico, and Arizona, and north through California and the Rocky Moun- 



1 Uinta Mts., Utah, Porter, and White Mts. of Mono Co., Calif., Coville & Fimston. 



2 Near Nuttallburg, West Virginia, ace. to Millspaugh, Fl. W. Va. 320, also E. Tennes.see, 

 Parry, Kearney. 



