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VlTACEAE. 



VITIS. Vine. Grape. 

 (Family Vitaceae). 



Rather hard-wooded climbers, 

 often very thick-stemmed in the 

 forest, with usually very flaking 

 bark: deciduous. Stems striate, 

 subterete or exceptionally angled, 

 moderate: pith moderate, brown, 

 continuous or somewhat fissued 

 near the swollen nodes, usually 

 with a firmer diaphragm at each 

 node. Tendrils opposite the leaf- 

 scars, not thickened at tip. Buds 

 subglobose, not superposed, but 

 collaterally branching, with 2 

 broad scales, the end-bud lack- 

 ing. Leaf-scars alternate, 2- 

 ranked, half-round or crescent-- 

 shaped: bundle-traces several in a 

 C-shaped series, usually indis- 

 tinct: stipule-scars long and nar- 

 row. References under Cissus. 



1. Pith without diaphragms: bark tight. (1). V. rotundifolia. 

 Pith firmer at the nodes: bark flaking. 2. 



2. Twigs distinctly angled, woolly. (2). V. cinerea. 

 Twigs nearly terete. 3. 



3. A tendril at each node. (Hybrids of, and) V. labrusca. 

 Tendrils lacking from usually each third node. 4. 



4. Spreading and rather bushy. V. rupestris. 

 Climbing. 5. 



5. Nodal diaphragms thin (under 1 mm.) (3). V. vulpina. 

 Nodal diaphragms thick (2-4 mm.). 6. 



6. Panicle vestiges open and large. V. cordifolia. 

 Panicle vestiges, compactly branched. V. aestivalis. 



