EANUNCULACEAE 437 



1.5-2.5 cm. long, coarsely cleft or parted, the segments more or less flaring, acute or acumi- 

 nate, sometimes toothed : peduncles mostly tricliotomous, sometimes simple : flowers few : 

 sepals 10-12 mm. long, slightly broadened upward, silky witliout : heads of fruit conspicu- 

 ous : achenes 2-3 mm. long : persistent styles very slender, 5-10 cm. long, silky-plumose. 

 In dry soil, Texas to Arizona and Mexico. Spring and summer. 



2. Clematis Virgiiiiana L. A long vine, climbing over bushes in low woodlands 

 and along fences and water-courses. Leaves glabrous or nearly so ; blades S-foliolate or 

 rarely 5-foliolate ; leaflets mostly broadly ovate, acute at the apex, toothed or lobed, some- 

 times slightly cordate : flowers white, in leafy-bracted })anicles, polygamo-dioecious : 

 calyx 15-30 mm. broad when expanded : sepals mainly oblong-spatulate : filaments gla- 

 brous : achenes very inequilateral : persistent styles plumose, 2.5 cm. long or more. 



In moist soil, Nova Scotia to Manitoba, Georgia and Kansas. Summer. Virgin's Bower. 



3. Clematis Cate^^byana Pursh. A climbing vine several m. long, with pubescent or 

 occasionally glabrate foliage. Leaves numerous ; blades mainly twice ternately comijound ; 

 leaflets suborbicular, ovate or lanceolate, 2-5 cm. long, acute or acuminate. 3-lobed, 

 ■otherwise entire or sparingly toothed : flowers relatively few in a panicle : calyx 2-2.5 

 cm. b' oad : sepals oblong or spatulate, 6-9 mm. long, obtuse, pubescent : achenes barely 

 inequilateral : persistent styles plumose. 



In sand or sandy soil, South Carolina to Florida and Mississippi. Spring and summer. 



16. VITICELLA Dill. 



Climbing or reclining vines. Leaves opposite : blades several-foliolate, the leaflets 

 •entire, lobed or parted. Flowers perfect, solitary on short branches or few together. 

 Sepals petal-like, spreading, each with a wide border on either side of the nerves, relatively 

 large. Petals wanting. Stamens spreading : anthers long and narrow. Pistils several. 

 Achenes 1 -seeded, with elongated, often pubescent but rarely plumose styles. 



1. Viticella Vitic611a ( L. ) Small. A branching vine several m. long, with minutely 

 pubescent foliage: leaves numerous ; leaflets thin, 2-5 cm. long; acute or apiculate, entire, 

 lobed or parted, mostly inequilateral : flowers showy, 4-8 cm. broad : sepals thin, cuneate 

 to cuneate-spatulate, spreading : achenes ovoid to elliptic-ovoid, 8-10 mm. long, minutely 

 pubescent, the styles relatively short, not plumose. [^Clematis Viticella 1j.'\ 



On rocky banks, Tennessee. Naturalized from Europe. Summer. 



17. VIORNA Eeichenb. 



Climbing vines, or perennial herbs, with erect or ascending, more or less woody 



stems. Leaves opposite : blades slender-petioled, pinnately-compound, lobed or in some 



species entire. Sepals 4 or 5, valvate in the bud, petal-like. Petals wanting. Stamens 



numerous, erect : anthers long and narrow. Pistils many. Achenes 1-seeded, with long 



persistent plumose, silky or naked styles. 



•Climbing or shrubby vines. 



Sepals relatively thin : styles silky at maturity, not plumose, rarely glabrous. 



Leaflets pinnately nerved : sepals recurved from near the middle. 1. V. crispa. 



Leaflets reticulated : sepals recurved at the tips. 2. V. Siinsii. 



Sepals leathery : styles plumose. 



Foliage glandular. 3. V. Gattingeri. 



Foliage glabrous, glaucous or simply pubescent. 



Leaflets prominently and conspicuously reticulated. 



Sepals dull purple, pubescent without. 4. V. reticulata. 



Sepals carmine or scarlet, glabrous without. 



Peduncles forking : calyx less than 2 cm. long : sepals thin. 5. V. versicolor. 



Peduncles simple : calyx over 2 cm. long: sepals thick. 6. V. coccinea. 



Leaflets not reticulated, sometimes with a few prominent nerves. 

 Elongated vines. 



Achenes oblong or elliptic : leaflets not glaucous beneath. 

 Leaflets simple and usually entire. 



Sepals over 2.5 cm. long: leaflets glabrous. 7. V. obliqua. 



Sepals less than 2.5 cm. long : leaflets silky beneath. 8. V. flaccida. 



Leaflets, at least the lower ones, ternate or 3-lobed. 9. V. Viorna. 



Achenes sitborbicular : leaflets glaucous beneath. 10. I'. glaucophyUa. 



Shrubby or stocky vine. 11. V. Addisonii. 



Upright perennial herbs. 



Leaf-blades reticulated, rounded or cordate at the base. 



Calyx yellowish green : style erect ; plumes brown at maturity. 12. V. ochroleuca. 



Calyx purple : style horizontal ; plumes white at maturity. 13. V. ovata. 



Leaf-blades not reticulated, mostly cuneately narrowed at the base. 14. V. Baldwinii. 



1. Viorna crispa (L. ) Small. A climbing vine, 1 m. long or much longer. Leaf- 

 blades pinnate ; leaflets mostly trifoliolate, the ultimate divisions entire or occasionally 



