Vitis

1a Leaves oval to suborbicular, shallowly to deeply 3- or 5-lobed, base deeply cordate, margin deeply and irregularly toothed. Fruits 15–25 mm in diameter … V. vinifera
b Leaves ovate to shallowly 3-lobed, base shallowly cordate to truncate, margin serrate to serrulate. Fruits up to 10 mm in diameter ……2.
2a Stems glabrous. Lower surface of leaf glabrous with some tufts of arachnoid hairs. Inflorescence 2–7 cm …. 1. V. flexuosa
b Stems hairy. Lower surface of leaf densely hairy. Inflorescence at least 7 cm long ……3.
3a Petioles, inflorescence peduncles and lower side of the leaves densely hairy with ferruginous arachnoid hairs. Stems densely hairy with ferruginous arachnoid hairs becoming floccose to glabrate. Pedicels up to 2.5 mm before the calyptra is shed …..2. V. heyneana
b Petioles, inflorescence peduncles and lower side of the leaves densely hairy with appressed villous hairs, and scattered arachnoid hairs. Stems densely villous and with scattered arachnoid hairs, but neither floccose nor glabrate. Pedicel more than (2.5–)3 mm before the calyptra is shed …..3. V. pedicellata

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FRLHT Indian Medicinal Plants Nomenclature Database with images/ herbarium, distribution, local names etc. :

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Pl. go through‎ Vitis ‎‎(Vitaceae‎) page with comparative images of species in efloraofindia. On clicking the link of species, one can check the complete details. Genus pages generally give details of most of the species found in India.
I request you to pl. go through & point out mistakes, if any. I hope this will aid in identifications in future. If anybody can send images of other species of this genus (for incorporation in the website), if any, or can identify unidentified images, it will be really nice.