Vitis arizonica |
Vitis rotundifolia |
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canyon grape |
muscadine, scuppernong |
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Habit | Plants sprawling to low climbing, shrubby, much branched. | Plants usually high climbing or sprawling, sometimes shrubby, usually sparsely branched. | ||||
Branches | bark exfoliating in plates; nodal diaphragms 1.5–3 mm thick; branchlets slightly angled when young, becoming terete, arachnoid or arachnoid-floccose, sometimes glabrescent, growing tips not enveloped by unfolding leaves; tendrils along length of branchlets, soon deciduous if not attached to support, branched, tendrils (or inflorescences) at only 2 consecutive nodes; nodes not red-banded. |
branchlets terete to slightly angled, usually sparsely grayish arachnoid, glabrescent, growing tips not enveloped by unfolding leaves; tendrils along length of branchlets, persistent, tendrils (or inflorescences) at only 2 consecutive nodes; nodes sometimes red-banded. |
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Leaves | stipules 1.5–3 mm; petiole 1/2 to ± equaling blade; blade cordate to cordate-ovate, 5–12 cm, usually unlobed to 3-shouldered, sometimes shallowly 3-lobed, apex acute to acuminate, abaxial surface not glaucous, moderately to sparsely arachnoid, visible through hairs, veins and vein axils sometimes only hirtellous, adaxial surface sparsely arachnoid or glabrous. |
stipules 1–2 mm; petiole mostly ± equaling blade; blade cordate to nearly reniform, 2–12 cm, rarely lobed, apex short acuminate, abaxial surface not glaucous, glabrous, visible through hairs, veins and vein axils sometimes sparsely to densely hirtellous, adaxial surface glabrous. |
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Inflorescences | 4–12 cm. |
3–8(–10) cm. |
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Flowers | functionally unisexual. |
functionally unisexual. |
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Berries | black, slightly or not glaucous, globose, 6–10 mm diam., skin separating from pulp; lenticels absent. |
usually black or purplish, sometimes bronze when ripe, glaucous, globose, 8–25 mm diam., skin separating from pulp; lenticels present. |
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2n | = 38. |
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Vitis arizonica |
Vitis rotundifolia |
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Phenology | Flowering Apr–Jun; fruiting Jul–Oct. | |||||
Habitat | Stream banks, canyon bottoms. | |||||
Elevation | 400–3000 m. (1300–9800 ft.) | |||||
Distribution |
AZ; NM; NV; TX; UT; Mexico (Chihuahua, Coahuila, Nuevo León, Sinaloa, Sonora)
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AL; AR; DE; FL; GA; KY; LA; MD; MO; MS; NC; OK; SC; TN; TX; VA; WV
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Discussion | Vitis arizonica is variable and intergrades with V. girdiana in southern Nevada; it is in need of in-depth field and experimental studies. Some authors have recognized two varieties of this species (vars. arizonica and glabra), but the characters used to distinguish them intergrade so freely that their recognition does not seem justified. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 12, p. 13. | FNA vol. 12, p. 7. | ||||
Parent taxa | Vitaceae > Vitis > subg. Vitis | Vitaceae > Vitis > subg. Muscadinia | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | V. arizonica var. galvinii, V. arizonica var. glabra, V. treleasei | Muscadinia rotundifolia | ||||
Name authority | Engelmann: Amer. Naturalist 2: 321. (1868) | Michaux: Fl. Bor.-Amer. 2: 231. (1803) | ||||
Web links |