FIGURE 4. A–D in A taxonomic survey of the genus Vitis L. (Vitaceae) in Italy, with special reference to Elba Island (Tuscan Archipelago)

FIGURE 4. A–D) Leaf bases; E–H) leaf margin teeth. A) U-shaped leaf base in V. ×instabilis; B) Lyre-shaped leaf base in V. vinifera; C) V-shaped leaf base in V. ×ruggerii; D) truncate leaf base in V. rupestris; E, G) acute teeth in V.riparia (E) and in V. ×instabilis (G); F, H) obtuse teeth in V ×ruggerii (F) and in V. ×koberi (H).