Vitaceae

The Vitaceae, or grape family, consists of about 20 genera and 910 species within its own order, Vitales. Its name comes from the genus *Vitis*, which includes grapevines, and also covers plants like Virginia creeper (*Parthenocissus quinquefolia*). Most species are tropical, often serving as dominant climbers with ecological importance, though some grow as shrubs or trees. Certain *Tetrastigma* species host parasitic plants from the Rafflesiaceae family. Some Vitaceae produce pearl bodies—tiny orbs on leaves or stems—that may defend the plant and feed arthropods like ants and mites. Chromosome numbers vary widely across the family, helping to distinguish species but also complicating hybridization. Economically, the family is key because *Vitis* berries (grapes) are a major fruit crop and the source of wine.

Members are usually climbers with tendrils opposite their leaves, considered highly successful in tropical and temperate vegetation. They range from vines and lianas to occasional shrubs or trees, and can be succulent. Their fruit is a berry, leaves are alternate, simple or compound, with toothed or lobed margins. *Tetrastigma diepenhorstii* and *T. rafflesiae* are specific hosts for *Rafflesia* parasites.

The family name is sometimes written as Vitidaceae, but Vitaceae is conserved and takes priority over Vitidaceae and the older Ampelidaceae. In the Cronquist, APG, and APG II systems, Vitaceae was placed near Rhamnaceae under order Rhamnales. APG III (2009) and APG IV (2016) moved it to its own order, Vitales, considered the most basal rosid order by molecular studies. Plants of the World Online accepts two subfamilies: Leeoideae and Vitoideae, sometimes treated as separate families. Leeoideae contains only *Leea*, once in its own family Leeaceae but now included in Vitaceae. Vitoideae has five tribes: Ampelopsideae (genera *Ampelopsis*, *Clematicissus*, *Nekemias*, *Rhoicissus*), Cayratieae (*Acareosperma*, *Afrocayratia*, *Causonis*, *Cayratia*, *Cyphostemma*, *Pseudocayratia*, *Tetrastigma*), Cisseae (*Apocissus*, *Cissus*), Parthenocisseae (*Parthenocissus*, *Yua*), and Viteae (*Ampelocissus*, *Nothocissus*, *Vitis*). *Pterisanthes* is placed incertae sedis.

Chromosome numbers vary: most *Vitis* subgenus Euvitis have 38 chromosomes (n=19), while subgenus Muscadinia has 40 (n=20). *Ampelocissus*, *Parthenocissus*, and *Ampelopsis* may have 40 (n=20), and *Cissus* often has 24 (n=12). These differences have led to reclassifications.

Distribution is mostly tropical, but some genera like *Ampelopsis* are restricted to north temperate areas, while *Nekemias*, *Parthenocissus*, *Vitis*, and *Yua* also live mainly in temperate zones. The family spans pantropical regions across Asia, Africa, Australia, the neotropics, and Pacific Islands, in habitats including tropical and temperate forests, savannas, and limestone mountains.

Viticulture—cultivating *Vitis* for grapes—drives the family’s economic value. Grapevine (*Vitis vinifera*) is one of the oldest fruit crops, domesticated 6,000–8,000 years ago in the Transcaucasian region, with over 40,000 cultivar names. The first American grape species cultivated was Muscadine (*Vitis rotundifolia*), dating to the mid-18th century.

The fossil record is rich across Australia, Asia (China, India), Europe, and the Americas, including wood, pollen, fruits, and seeds. *Indovitis chitaleyae* is considered the earliest Vitaceae example. A 2013 study examined its fruits and seeds from Late Cretaceous Deccan Intertrappean beds in central India, with immature fruits bearing 4–6 seeds each.