Riverbank Grape - Vitis riparia
* (see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
Vitis riparia grows in riparian and woody draw habitats and on fences in a small portion of Montana. More current data on population size, distribution, and threats is needed before warranting it as a Species of Concern.
- Details on Status Ranking and Review
ScoreF - 20,000-200,000 sq km (~8,000-80,000 sq mi)
Area of Occupancy
ScoreD - 6-25 4-km2 grid cells
Number of Populations
ScoreB - 6 - 20
ScoreC - Moderate. Generalist or community with some key requirements scarce
ScoreU - Unknown
ScoreU - Unknown
ScoreD - Low
CommentThreat categories include: Ecosystem modifications.
ScoreBC - Moderately vulnerable to not intrinsically vulnerable
Plants: Woody vines (Lesica 2012), climbing or spreading up to 25 m, the bark typically coming loose and falling off in peels (McGregor et al. 1986).
Leaves: Leaves long-petiolate, alternate; blades cordate-ovate, palmately and shallowly lobed, glabrous above, puberulent on veins below, 5–12 cm in length (Lesica 2012), width similar to length, basal sinus wide; margins with wide, acuminate teeth; teeth sometimes with 1 or both sides concave (McGregor et al. 1986); tendrils branched, opposite the upper leaf axils, without adhesive disks (Lesica 2012).
Inflorescence: A branched panicle from upper leaf nodes (Lesica 2012), compact, 4-12 cm in length, axis minutely hairy to nearly smooth (McGregor et al. 1986). (Lesica’s contribution adapted from Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX.)
Flowers May-June. Fruits July-September (McGregor et al. 1986).
MT to QC south to NM, TX and TN (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Flowers: Functionally unisexual, 5-merous; calyx reduced, faintly lobed; petals separate, early deciduous; stamens 5; ovary superior; style 1 (Lesica 2012).
Fruit: A purple, globose berry, glaucous, 7–11 mm across, 2-celled with 2 seeds per cell (Lesica 2012); seeds reddish-brown, 4.5-5.5 mm in length (McGregor et al. 1986).(Lesica’s contribution adapted from Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX.)
Sometimes cultivated for its autumn leaf colors, Riverbank Grape may escape or persevere after other traces of human occupation have disappeared (Hitchcock et al. 1961).
- Literature Cited AboveLegend: View Online Publication
- Hitchcock, C. L., A. Cronquist, M. Ownbey, and J. W. Thompson. 1961. Vascular Plants of the Pacific Northwest, Part 3. Saxifragaceae to Ericaceae. Seattle, WA and London, England: University of Washington. 614 pp.
- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- McGregor, R.L., coordinator, and T.M. Barkley, R.E. Brooks, and E.K. Schofield, eds.: Great Plains Flora Association. 1986. Flora of the Great Plains. Lawrence, KS: Univ. Press Kansas. 1392 pp.