Trelease.] 302 [March 17, 



wing-nerved, as inT. purpurascens and T. polygamum, are re- 

 garded as hybrids. 1 



7. T. debile, Buckley, Am. Journ. Sci. xlv, 175. — Glabrous. 

 Stem from a cluster of fusiform tuberous roots, weak and decum- 

 bent, 4-14 in. high, sparingly branched or simple ; few-leaved, 

 with remote sheathing scales below ground. Leaves 2-3-ternate, 

 on long, slender petioles. Leaflets -3-5- in. long, long-stalked and 

 remote, thin and pale, rotund, 3-lobed at the apex, the rounded 

 lobes entire or again similarly lobed. Flowers small, dioecious, 

 long-pedicelledand remote in an elongated, sub-simple, strict pan- 

 icle. Stamens about ten, their filaments short but slender ; 

 anthers oblong-linear, mucronate, 2 mm. long. Achenia 2-5, sub- 

 sessile, spreading, oblong, terete, with 8-10 ribs, nearly beakless. 

 — Georgia, Alabama and Texas. 



Var. Texandm, Gray, Cat. Coll. Hall, PI. Tex. 3, is a form 

 from Texas, with more rigid stem and smaller, thicker, nearly ses- 

 sile leaflets. 



8. T. dioicum, L. Sp. 768. Glabrous. Stem erect, 1-2 ft. high, 

 not very stout, sparingly branched, leafy. Leaves 2-4-ternate, 

 the lowermost petioled. Leaflets thin and pale, orbicular, or the 

 terminal cuneate-obovate, 7-9-lobed at the summit, the principal 

 sinuses widening at maturity ; lobes rounded or short pointed. 

 Flowers appearing with the leaves ; dioecious, of medium size, 

 drooping in lateral umbels that form a loose corymbose panicle in 

 luxuriant specimens. Stamens many, their very slender filaments 

 twice the length of the sepals ; anthers linear, 2-5 mm. long, with 

 a broad, thin point. Achenia 6-10, subsessile, ovoid ; 3 mm. long, 

 blunt or acutish, terete with 10-12 deep and equal, longitudinal 

 grooves, separating as many stout, rounded ridges ; thick-walled, 

 filled by the seed. Stigma elongated, commonly breaking away, 

 near the base. — Canada to Alabama, west to Kentucky, Nebraska 

 and Minnesota. Specimens from the Atlantic States, both north 

 and south, with nearly the foliage of this species but stipitate 

 2 edged achenia, are regarded as hybrids with T. purpurascens or 

 T. polygamum. 



9. T. venulosum, n. sp. — Glabrous and glaucous, the stem, pet- 

 ioles and sepals purple-tinted, the foliage typically pale or whi- 

 tened. Stem simple, erect, 7-20 inches high. Stem leaves 2-3, 

 long petioled, 3-4-ternate. Leaflets approximated, short stalked, 



1 For additional remarks on these two species see Bot. Gazette, Apr. 1886, pp. 92-3. 



