RANUNCULA CEAE. 4 2 1 



Flowers solitary; filaments pubescent. 



Fruiting styles silky, not plumose; sepals thin. 



Sepals conspicuously dilated; leaflets thin, pinnately veined. 4. C. crispa. 

 Sepals with recurved tips; venation strongly reticulated. 5. C. Simsii. 

 Fruiting styles plumose. 



Leaflets thick, strongly reticulated, glaucous beneath. 6. C. versicolor. 



Leaflets thin, not strongly reticulated. „.-•._, 



Leaflets all simple, pubescent beneath. 7. L.fiaccida. 



Lower leaflets ternate or 3-lobed, glabrate, or nearly so. 

 Leaflets or their lobes rounded, ovate or subcordate. 



8. C. glaucophylla. 

 Leaflets or their lobes ovate or ovate-lanceolate. 9. C. Viorna. 

 » * Erect or ascending perennial herbs ; leaves simple or pinnate. 

 Glabrous, glaucous ; leaves simple, or pinnate and tendril-bearing. 10. C. Addisonii. 

 Pubescent; leaves simple or pinnate, not tendril-bearing. 

 Leaves simple, entire or rarely lobed. 



Fruiting styles long, plumose; eastern species. _ 



Flowers vellowish-green; style-plumes brown, achenes straight. 



11. C. ochroleuca. 

 Flowers purple ; style-plumes white ; achenes distinctly oblique. 



12. C. ovata. 

 Fruiting styles short, 1 cm., silky below, naked above; western species. 



13. C. Fremontii. 

 Leaves pinnate, or the lowest entire. x 4- <?• Scottn. 



1. Clematis Virginiana L. Virginia Virgin's Bower. (I. F. f. 1582.) 

 Leaflets mostly broadly ovate, acute at the apex, toothed or lobed, sometimes 

 slightly cordate; flowers white, in leafy panicles, polygamo-dicecious, 16-30 mm. 

 broad when expanded; persistent styles plumose, 2-4 cm. long or more. In 

 low woodlands and along fences and watercourses. Ga. to Kans., northward to 

 N. S. and Manitoba. Leaves rarely 5-foliolate. July-Sept. 



2. Clematis ligusticifolia Nutt. Western Virgin's Bower. (I. F. f. 

 1583.) Leaves pinnately 5-folioliate; leaflets oblong or ovate- lanceolate, acute and 

 sometimes acuminate at the apex, rounded or cuneate at the base, toothed, lobed 

 or divided; flowers white, in leafy panicles; persistent styles plumose throughout, 

 nearly white, 3-5 cm. long. Neb., Mo. and throughout the Rocky Mts., west to 

 the Pacific Coast. June-Aug. 



3. Clematis Missouriensis Rydb. n. sp. Missouri Virgin's Bower. 

 Stem obtusely angled, silky-puberulent. Leaves pinnately 3-5-foliolate; leaflets 

 ovate or cordate, often 3-lobed and incised; flowers dull white, polygamo-dioecious 

 in rather small panicles, the branches often subumbellate; achenes lanceolate-ovate, 

 pubescent, 4 mm. long, with a plumose style 3 cm. long. Rich woods in the Mis- 

 souri Valley from Mo. to Kans. and Neb. Type from Lincoln, Neb. July-Sept. 

 Has been confused with C. Virginiana and C. Catesbyana. 



4. Clematis crispa L. Marsh Clematis. (I F. f. 1584.) Leaves pinnate; 

 leaflets mostly trifoliolate. the ultimate divisions entire or occasionally lobed, gla- 

 brous and thin; flowers nodding, bluish-purple, 20-35 mm - l° n g; calyx cylindric 

 below, but the sepals thin and widely spreading above, their margins undulate; 

 persistent styles silky, not plumose. In marshes, S. E. Va. to Fla. and Tex. 

 May-June. 



5. Clematis Simsii Sweet. Sims' Clematis. (I. F. f. 1585.) High climb- 

 ing, the branches more or less pubescent. Leaves pinnate; leaflets entire, lobed or 

 trifoliolate. thick reticulated, generally mucronate; calyx campanulate, less than 

 2.5 cm. long, purplish, pubescent; persistent styles more or less pubescent. South- 

 ern Ind. to Mo., Neb. and Tex. May-Aug. 



6. Clematis versicolor Small, n. sp. Pale Clematis. A branching vine, 

 glabrous or slightly pubescent below the nodes. Leaves pinnate; leaflets firm, 

 oblong to ovate-lanceolate, 2-7 cm. long, conspicuously reticulate, very glaucous 

 beneath; sepals thin, lanceolate, about 2 cm. long, glabrous, slightly recurved at 

 the tip. Rocky ledges, Mo. and Ark. July. Type from McDonald Co., Mo. 



7. Clematis flaccida Small, n. sp. THIN-LEAVED Clematis. Stem climbing 

 over bushes, angled, pubescent or glandular. Leaves pinnate; leaflets oblong or 

 ovate-lanceolate, 2-10 cm. long, slender-stalked, apiculate or rarely acuminate; 

 calyx greenish to light lavender, 1.5 cm. long, nodding; sepals acutish, pubescent 



