GENUS 27. 



CROWFOOT FAMILY. 



12- 



7. Viorna ochroleuca (Ait.) Small. Erect 

 Silky Leather-flower. Fig. 1950. 



Clematis ochroleuca Ait. Hort. Kew. 2: 260. 1789. 

 Clematis sericea Michx. Fl. Bor. Am. I : 319. 1803. 

 Viorna ochroleuca Small, Fl. SE. U. S. 439. 1903. 



An erect silky-hairy plant, i-2 high, somewhat 

 woody at the base. Leaves simple, sessile, ovate, 

 obtuse, glabrous and reticulated above, silky be- 

 neath, entire or occasionally lobed, mucronate ; 

 flower terminal, nodding, 10" long; calyx cylindra- 

 ceous, green ; sepals thick, very silky without, their 

 tips recurved ; head of fruit erect ; achenes scarcely 

 oblique; persistent styles yellowish-brown, plumose 

 throughout, i'-2' long. 



Staten Island, Pennsylvania, and southward to 

 Georgia. Local. Dwarf clematis. Curly-heads. May- 

 June. 



8. Viorna ovata (Pursh) Small. Erect Moun- 

 tain Leather-flower. Fig. 1951. 



Clematis ovata Pursh, Fl. Am. Sept. 736. 1814. 

 V. ovata Small, Fl. SE. U. S. 439. 1903. 



Similar to the preceding species, stems stiff, i-2 

 tall, pubescent when young, becoming nearly gla- 

 brous when old. Leaves ovate, entire, \\'-2 r long, 

 strongly reticulate-veined and nearly glabrous when 

 mature ; flowers solitary at the ends of the stem or 

 branches, purple, nodding, nearly i' long; achenes 

 distinctly oblique ; persistent styles plumose through- 

 out, the plumes white, turning brown, i'-ij' long. 



Rocky soil, mountains of Virginia and West Virginia 

 to South Carolina. May-June. 



9. Viorna Fremontii (S. Wats.) Heller. Fre- 

 mont's Leather-flower. Fig. 1952. 



Clematis Fremontii S. Wats. Proc. Am. Acad. 10 : 339 



1875. 

 Clematis ochroleuca var. Fremontii J. F. James, Journ. 



Cine. Soc. Nat. Hist. 6: 120. 1883. 

 V. Fremontii Heller, Muhlenbergia 6: 96. 1910. 



Stout, erect, 6'-i5' high, the stem villous-pubes- 

 cent/ especially at the nodes, woody at the base, sim- 

 ple or branched. Leaves simple, sessile, coriaceous, 

 conspicuously reticulated, glabrous except on the 

 veins beneath, broadly ovate, obtuse or acutish, entire 

 or sparingly toothed; flowers terminal, nodding; 

 calyx purple, i' long; sepals thick, tomentose on 

 the margins, their tips recurved; head of fruit i' in 

 diameter or more, erect; persistent styles about \' 

 long, silky below, naked above. 



Prairies and limestone hills, Kansas, Nebraska, and 

 Missouri. April-May. 



