Vitis mustangensis
Vitis riparia
mustang grape
frost grape, river grape, river-bank grape, vigne de rivages
bark exfoliating in shreds;
nodal diaphragms 1.5–3 mm thick;
branchlets subterete to terete, densely to sparsely tomentose, 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.
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.
stipules 1.5–4 mm;
petiole 1/2–3/4 blade;
blade cordate to nearly reniform, 6–14 cm, usually unlobed but sometimes 3-shouldered or deeply 3–5 lobed, apex acute to obtuse, abaxial surface not glaucous, densely white to rusty tomentose, concealed (except sometimes veins) by hairs, adaxial surface floccose to glabrate.
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.
4–10 cm.
(4–)9–12 cm.
functionally unisexual.
functionally unisexual.
usually black, sometimes dark red, slightly or not glaucous, globose, 12+ mm diam., skin separating from pulp;
lenticels absent.
black, heavily glaucous, globose, 8–12 mm diam., skin separating from pulp;
lenticels absent.
= 38.
= 38.
Vitis mustangensis
Vitis riparia
In several early publications (for example, T. V. Munson 1909), Vitis mustangensis was known as V. candicans Engelmann ex A. Gray. M. O. Moore (1991) argued that the name V. candicans is ambiguous and not identifiable with any species based on the original description, making the more recent name V. mustangensis the valid and legitimate one for this species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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