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Nannyberry - Viburnum lentago
State Rank Reason (see State Rank above)
Three known occurrrences in eastern Montana.
Nannyberry is a tall shrub that is up to 3 m high with usually smooth, gray to reddish brown bark. The opposite leaves have broadly elliptic, pointed blades that are 5-9 cm long with finely toothed margins. The winged petioles are 10-27 mm long and have sparse, reddish brown hairs at the base. Foliage is glabrous. Small flowers are borne in open, umbrella-like inflorescences that are 5-12 cm across and sessile amongst leaves on the tips of the branches. Each flower has a tubular calyx with 5 short lobes and a white, bell-shaped, 5-lobed corolla that is 2-3 mm long. The 5 stamens are exserted from the corolla. The dark blue, globose fruit is 10-14 mm long and has a thin, whitish, waxy coating.
Flowering in June.
The other species of Viburnum
in our area have lobed leaves. Viburnum lentago
is more likely to be confused with Cornus stolonifera
, which has red twigs and entire-margined leaves.
MB to QC, south to CO, NE, MO and GA (Lesica et al. 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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(Observations spanning multiple months or years are excluded from time charts)
Openings in riparian forests on the plains.
Ecological Systems Associated with this Species
The following animal species have been reported as pollinators of this plant species or its genus where their geographic ranges overlap: Bombus pensylvanicus
and Bombus griseocollis
(Colla and Dumesh 2010).
Threats or Limiting Factors
STATE THREAT SCORE REASON
Reported threats to Montana's populations of Nannyberry (Viburnum lentago) are currently assigned as unknown. Most populations occur where coal strip mining is a potential source of threats, but the status of active mining is not known. Negative impacts to Nannyberry’s very restricted habitat may have potentially severe outcomes. Threats due to mining need to be substantiated before a threat rank can be assigned (MTNHP Threat Assessment 2021).
- Literature Cited AboveLegend: View Online Publication
- Colla, S.R. and S. Dumesh. 2010. The bumble bees of southern Ontario: notes on natural history and distribution. Journal of the Entomological Society of Ontario 141:39-68.
- 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), T.M. Barkley, R.E. Brooks, and E.K. Schofield (eds). 1986. Flora of the Great Plains: Great Plains Flora Association. Lawrence, KS: Univ. Press Kansas. 1392 pp.
- Additional ReferencesLegend: View Online Publication
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- Lesica, P. 1994. Vegetation and ecological condition of the south Wolf Mountains, Padlock Ranch, Big Horn County, Montana. Unpublished report for The Nature Conservancy, Montana Field Office, Helena. 12 pp.
- Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized). Agriculture Handbook No. 541. U.S. Forest Service, Washington, D.C. 375 pp.
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