RANUNCULACEAE. 



Vol. 11. 



-^ 



Clematis virginiana L. 



Virginia \ irgin's Bower. 

 Clematis virginiana L. Amoen 

 A long 



I'ig. 1942. 



Acad. 4: 275. 1759. 



vine, climbing over bushes in low 

 woodlands and along fences and water-courses. 

 Leaves glabrous or nearly so, trifoliolale; leatlets 

 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 5-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. Calesbyana Pursh. of the southern 

 states and may be specifically distinct. 



2. Clematis ligusticifolia Xutt. Western 

 \'irgin'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-foIiolate, the lower pair of leaf- 

 lets generally remote from the upper; leaflets olilong 

 gr 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"-9" broad when expanded, the stamens 

 about equalling the sepals; filaments glabrous; 

 persistent styles plumose throughout, nearly white, 

 l'-2' long. 



Western Nebraska, Missouri, and throughout the 

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

 flower. June-.^ug. 



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 itrnigera 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. 



2. /'. Addisonii. 



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. 



V. Pilcheri. 

 V, versicolor. 



V. V 



lorna. 



6. I', glaucophylla. 



V, ochrolenca, 

 V. ovata. 

 V. Frcniontii. 

 V. Scottii. 



