512 MINNESOTA BOTANICAL STUDIES. 



T. petaloideum LINN. Sp. PI. 2 ed. 771. 1762. 



Stem round, nearly i ft. high, almost naked : leaves 3-5- 

 parted; leaflets smooth, ovate, entire, or 3-lobed : flowers cor- 

 ymbose, perfect ; sepals white, rotund ; filaments pink, anthers 

 yellow : fruits ovate-oblong, striated, sessile. June-July. 

 Northern Asia. Bot. Cab. 9: 891. Not yet in trade lists but 

 well worthy of use in gardens (f). Lee. 3.^". 75. 



T. clavatum DC. Syst. i : 171. 1818. 



T.filtyes TORR. & GRAY, Fl. i : 38. 1838. 



T. nudicaule SCHWEINITZ ex T. & G. Fl. i : 39. 1838. 



Plant glabrous, i to 2 feet high, branching above : leaves 2 

 to 3 times ternate : leaflets oval to obovate, rather large, thin, 

 about 3-lobed but variable, base variable : flowers perfect, in a 

 cymose panicle ; filaments spatulate and petal-like, with short, 

 blunt anthers : akenes widely spreading on weak stalks of nearly 

 their own length, obliquely ovoid, flattened; styles short; stig- 

 ma minute. May, June. Wet mountain places, western Vir- 

 ginia to Alabama (f). Lee. 3. f. 10. 



T. sparciflorum TURCZ. F. & M. Ind. Sem. Petrop. i : 40. 



1835- 



T. clavatum HOOK. Fl. i : 2. 1833, not DC. 

 T. Richardsonii GRAY, Am. Journ. Sci. 42: 17. 1842. 



Stem erect, sulcate, 2 to 4 feet high, branching, usually gla- 

 brous : leaves triternate, upper ones sessile ; leaflets short- 

 stalked, round or ovate, variable in size and shape of base, round- 

 lobed or toothed : flowers in leafy panicles on slender pedicels, 

 perfect ; sepals obovate, whitish, soon reflexed ; filaments some- 

 what widened ; anthers very short : akenes short-stalked, ob- 

 liquely obovate, flattened, dorsal margin straight ; 8-io-nerved ; 

 styles persistent. Northern Asia, through Alaska to Hudson 

 Bay, in mountains in Colorado and southern California. Intro- 

 duced to gardens in 1881. Lee. 3. f. 8. 



T. alpinum LINN. Sp. PI. 545. 1753. 



Stems smooth, naked or i-leaved, only 4 to 8 inches high, 

 from a scaly rootstock : leaves tufted at the base, twice 3-5- 

 parted ; leaflets coriaceous, orbicular or cuneate at the base, 

 lobed, revolute : flowers in a raceme, perfect ; sepals greenish, 

 equalling the yellow stamens : stigma linear ; akenes small, ob- 

 liquely obovoid. Newfoundland to Arctic Alaska, in Rockies 



