GENUS 27. 



CROWFOOT FAMILY. 



i. Viorna crispa (L.) Small. Marsh 

 Leather-flower. Fig. 1944. 



Clematis crispa L. Sp. PI. 543. 1753. 



Clematis cylindrica Sims, Bot. Mag. pi. 

 1160. 1809. 



Viorna cylindrica Spach, Hist. Veg. 7 : 269. 

 1839. 



Viorna crispa Small, Fl. SE. U. S. 437. 

 1903. 



A climbing vine. Leaves pinnate ; 

 leaflets mostly trifoliolate, the ultimate 

 divisions entire or occasionally lobed, 

 glabrous and thin; flowers solitary, 

 nodding, bluish-purple, 9"-! 8" long; 

 calyx cylindric below, but the sepals 

 thin and widely spreading above, their 

 margins undulate; filaments hairy; per- 

 sistent styles silky, not plumose. 



In marshes, Pennsylvania to Missouri, 

 Arkansas, Florida and Texas. Blue-jessa- 

 mine. Blue-bell. Curl-flowered clematis. 

 May-June. 



2. Viorna Addisonii (Britton) Small. Addison Brown's Leather-flower. 



Fig- 1945- 



C, Addisonii Britton, Mem. Torn Club 2 : 28. 1890. 

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



Ascending or suberect, i-3 l f ng, simple or 

 branched, tufted, glaucous and glabrous. Lower 

 leaves simple, entire or i-4-lobed, obtuse, deep 

 bluish-green above, glaucous beneath, sessile, 

 clasping, 2'-^' long; upper leaves pinnate, or 

 sometimes simple, tendril-bearing; leaflets 2-4, 

 ovate, sessile; flowers solitary, terminal and axil- 

 lary, purplish, nodding; calyx ovoid, 9"-is" 

 long, 5"-7" broad, contracted near the summit; 

 sepals thick, lanceolate, acute, their tips re- 

 curved ; stamens numerous, pubescent above, 

 filaments twice as long as the anthers; achenes 

 flat, nearly orbicular, silky-pubescent; persistent 

 styles i'-ii' long, brownish-plumose throughout. 



Banks, southwestern Virginia and North Caro- 

 lina ; recorded from Tennessee. May-June. 



Clematis viornioides Britton is a hybrid between 

 this and V. Viorna. Roanoke, Va. 



i 



3. Viorna Pitched (T. & G.) Britton. 

 Pitcher's Leather-flower. Fig. 1946. 



Clematis Pitcheri T. & G. Fl. N. A. 1 : 10. 1838. 

 V. Simsii Small, Fl. SE. U. S. 438. 1903. Not 

 Clematis Simsii Sweet. 



A high climbing vine, the branches more or 

 less pubescent. Leaves pinnate ; leaflets entire, 

 lobed or trifoliolate, thick, reticulated, generally 

 mucronate; flowers solitary; calyx campanu- 

 late, less than i' long, purplish, pubescent ; 

 sepals with recurved margined tips ; filaments 

 hairy; persistent styles more or less pubescent, 

 about i' long. 



Southern Indiana to Missouri, Nebraska and 

 Texas. May-Aug. 



