122 



RANUNCULACEAE. 



VOL. II. 



i. Clematis virginiana L. Virginia Virgin's Bower. Fig. 1942. 



Clematis virginiana L. Amoen. Acad. 4: 275. 1759. 



A long vine, climbing over bushes in low 

 woodlands and along fences and water-courses. 

 Leaves glabrous or nearly so, trifoliolate; leaflets 

 mostly broadly ovate, acute at the apex, toothed 

 or lobed, sometimes slightly cordate; flowers 

 white, in leafy panicles, polygamo-dioecious, 

 8"-is" broad when expanded ; filaments glabrous ; 

 persistent styles plumose, i' long or more. 



Georgia to Tennessee, northward to Nova Scotia 

 and Manitoba. Leaves rarely s-foliolate. Ascends to 

 2600 ft. in Virginia. Woodbine. Traveler's-joy. 

 Love-vine. Devil's-hair or -darning-needle. Wild 

 hops. July-Sept. 



Clematis missouriensis Rydb., of Missouri, Kan- 

 sas and Nebraska, differs in having marginless 

 achenes and in being more pubescent ; it has been 

 confused with C. Catesbyana Pursh, of the southern 

 states and may be specifically distinct. 



2. Clematis ligusticifolia Nutt. Western 

 Virgin's Bower. Fig. 1943. 



C. ligusticifolia Nutt. ; T. & G. Fl. N. A. i : 9. 1838. 



A trailing and climbing vine, nearly glabrous. 

 Leaves pinnately 5-foliolate, the lower pair of leaf- 

 lets generally remote from the upper ; 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, 6"-g" broad when expanded, the stamens 

 about equalling the sepals ; filaments glabrous ; 

 persistent styles plumose throughout, nearly white, 

 i '-2' long. 



Western Nebraska, Missouri, and throughout the 

 Rocky Mountain region, west to the Pacific Coast. Wind- 

 flower. June-Aug. 



27. VIORNA Reichb. ; Spach, Hist. Veg. 7 : 268. 1839. 



Vines or erect perennial herbs, with opposite pinnately compound or simple leaves. 

 Flowers mostly solitary. Sepals 4 or 5, petal-like, valvate in the bud, erect or converging. 

 Petals none. Stamens numerous, parallel with the sepals; anthers narrow, linear. Pistils 

 numerous; styles plumose or silky. Achenes flattish, the long styles persistent. [Name 

 unexplained.] 



About 20 species, natives of Europe and North America, extending into Mexico. In addi- 

 tion to the following, some 10 species inhabit the southern and western parts of North America. 

 Type species: Clematis Viorna L. (Viorna urnigera Spach.). Called Leather-flower or Clematis. 



* Climbing vines (no. 2 suberect). 



Sepals thin, conspicuously dilated. i. V.crispa. 



Sepals thick, not dilated, their tips recurved. 



Leaves, or most of them simple, entire or little lobed ; filaments twice as long as the anthers. 



Leaves, or some of them, pinnate or trifoliolate. 

 Fruiting styles silky, not plumose. 

 Fruiting styles plumose. 



Leaves strongly reticulated. 

 Leaves not strongly reticulated. 



Calyx pubescent ; anthers long-tipped. 

 Calyx glabrous ; anthers short-tipped. 



** Erect perennial herbs. 

 Leaves simple, entire or rarely lobed. 



Fruiting styles long, plumose ; eastern species. 

 Flowers yellowish-green ; achenes straight. 

 Flowers purple ; achenes distinctly oblique. 

 Fruiting styles short, silky ; western species. 

 Leaves pinnate, or the lowest entire. 



2. V '. Addisonii. 



3. V. Pitcheri. 



4. V. versicolor. 



5. V. Viorna. 



6. V. glaucophylla. 



7. V. ochrolenca. 



8. V. ovata. 



9. V. Fremontii. 

 10. V.Scottii. 



