C. Leaves and shoots glabrous at maturity and without bloom. Tendrils intermittent (_V. cinerea_ and _V. arizonica_ are partial exceptions and might be looked for under C.C.). D. Leaves thin, light, bright green, generally glabrous below at maturity except perhaps in the axils of the veins (_V. champini_ an exception) with a long or at least a prominent point and usually long and sharp teeth or the edge even jagged. (_V. bicolor_ might be looked for here.) E. Leaves broader than long; petiolar sinus usually wide and shallow. (_V. treleasei_ might be sought here.) =3. V. rupestris.= E.E. Leaves ovate in outline; petiolar sinus usually medium to narrow. F. Diaphragms thin; young shoots not red.=4. V. monticola.= =5. V. riparia.= =6. V. treleasei.= =7. V. longii.= =8. V. champini.= F.F. Diaphragms thick; young shoots bright red =9. V. rubra.= D.D. Leaves thickish, 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; the point mostly rectangular and conspicuous. E. Plants strong, climbing, with stout persistent tendrils. F. Young shoots cylindrical, glabrous or very soon becoming so =10. V. cordifolia.= F.F. Young shoots angled, covered the first year with tomentum or wool =11. V. baileyana.= =12. V. berlandieri.= =13. V. cinerea.= E.E. Plants scarcely climbing, tendrils perishing when without support =14. V. arizonica.= D.D.D. Leaves orbicular, scallop shaped; species of the Pacific Coast =15. V. californica.= C.C. Leaves rusty or white tomentose or glaucous blue below, thick or at least firm. (_V. cinerea_, _V. arizonica_ and possibly _V. californica_ might be sought here.) D. Leaves flocculent or cobwebby or glaucous below when fully grown (i. e. not covered with a thick dense felt-like tomentum except sometimes in _V. doaniana_).