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Winter Grape is one of several native Vitis spp. (Wild Grapes) in Illinois. It can be distinguished from most species of Wild Grape by the cobwebby hairs on its branchlets, petioles, and leaf undersides. A notable exception is Vitis aestivalis (Summer Grape), which also has cobwebby hairs, although they are usually less dense and conspicuous. The leaves of Summer Grape occasionally have deep lobes, while the leaves of Winter Grape never have deep lobes. The branchlets of Summer Grape are round in circumference, while the branchlets of Winter Grape are usually angular. The seeds of Summer Grape are somewhat larger in size (5-8 mm. in length) and the surface of its fruit has a whitish bloom. Winter Grape has seeds that are only 3-5 mm. in length and its fruit lacks a whitish bloom.


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© John Hilty

Source: Illinois Wildflowers


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