RANUNCULA CEA E. 42 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. verstcolor. 



Leaflets thin, not strongly reticulated. 



Leaflets all simple, pubescent beneath. 7. C.flaccida. 



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. Vwrna. 

 * * 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 yellowish-green; style-plumes brown, achenes straight. 



n. C. ochroleuca. 

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



12. C. ova fa. 

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



13. C. Fremontii. 

 Leaves pinnate, or the lowest entire. J 4- C. Scottii. 



x. 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-dioecious, 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 Kims., 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 verslcolor 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 



