Manual of American grape-growing

by U. P. Hedrick

1. V. rotundifolia.
2. V. Munsoniana.

BB. Nodes with diaphragms; tendrils forked.

C. Leaves and shoots glabrous at maturity and without bloom; tendrils intermittent.

D. Leaves thin, light, bright green, generally glabrous below at maturity except perhaps in the axils of the veins with a long or at least a prominent point and usually long and sharp teeth or the edge even-jagged.

E. Leaves broader than long; petiolar sinus usually wide and shallow.

3. V. rupestris.

EE. Leaves ovate in outline; petiolar sinus usually medium to narrow.

4. V. vulpina.

DD. Leaves thick, dull colored or grayish-green, often holding some close, dull pubescence below at maturity, shoots and leaves nearly always more or less pubescent when young; the teeth mostly short.

5. V. cordifolia.
6. V. Berlandieri.