Vitis riparia
Vitis ×champinii
frost grape, river grape, river-bank grape, vigne de rivages
Champin's grape
bark exfoliating in shreds;
nodal diaphragms to 0.5 mm thick;
branchlets terete, glabrous or sparsely hirtellous, growing tips enveloped by unfolding leaves, glabrous or sparsely hairy;
tendrils along length of branchlets, persistent, branched, tendrils (or inflorescences) at only 2 consecutive nodes;
nodes not red-banded.
bark tardily exfoliating in shreds;
nodal diaphragms 1.5–2.5 mm thick;
branchlets terete, sparsely arachnoid, becoming glabrate, growing tips not enveloped by unfolding leaves;
tendrils along length of branchlets, persistent, branched, tendrils (or inflorescences) at only 2 consecutive nodes, nodes not red-banded.
stipules 3–5 mm;
petiole 1/2 to ± equaling blade;
blade cordate, 6–20 cm, 3-shouldered to shallowly 3-lobed, apex short acuminate, abaxial surface not glaucous, glabrate, visible through hairs, veins and vein axils hirtellous, adaxial surface glabrous.
stipules 2–5.5 mm;
petiole 1/2 blade;
blade usually cordate, sometimes nearly reniform, 5–15 cm, usually 3-shouldered to very shallowly 3-lobed, apex acute to short acuminate, abaxial surface not glaucous, sparsely arachnoid to glabrate, not hirtellous, visible through hairs, adaxial surface usually glabrous.
(4–)9–12 cm.
3–7 cm.
functionally unisexual.
functionally unisexual.
black, heavily glaucous, globose, 8–12 mm diam., skin separating from pulp;
lenticels absent.
black, usually not, sometimes very slightly, glaucous, globose, 12+ mm diam., skin separating from pulp;
lenticels absent.
= 38.
= 38.
Vitis riparia
Vitis ×champinii
Vitis riparia is native throughout much of its range. It has become naturalized in a few locations in Saskatchewan, Oregon, and Washington. Plants on dunes around the Great Lakes with hairier petioles and leaf blades sometimes have been recognized as var. syrticola; variation in hairiness is essentially continuous, however, and the form is not worthy of taxonomic recognition (P. M. Catling and G. Mitrow 2005).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Vitis ×champinii is found on and adjacent to the Edwards Plateau and is a hybrid between V. mustangensis and V. rupestris; it is now rare in nature (B. L. Comeaux 1987).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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