In New York dwarf sand cherry is most often found on the islands and banks of large rivers, where scouring ice prevents trees and large shrubs from persisting. The prostrate, ground-hugging stems of this subspecies appear well adapted to these unique habitats. The fruit is the largest of all the native cherry species in New York and is edible but tart.
There are 14 known populations and half of these are large containing hundreds of plants. There are about five additional historical records which need to be checked.
Many new populations have been documented in the last 20 years. All of the monitored extant populations of this plant appear to be persisting.
More research into the historical record is needed to determine the long-term population trend of this species in New York. Dwarf sand cherry forms spreading clones and is well-adapted to disturbance, so individual populations may be very long-lived.
Dams or other changes to the hydrologic and disturbance regimes of this plant's habitats are likely the greatest potential threat to this plant. Deer herbivory is another potential threat. Invasive non-native plants such as Lythrum salicaria and Euphorbia cyparissias are spreading into Prunus pumila habitat.
No current management needs are apparent. Known populations should be monitored.
Ecological studies are needed to better understand this species' dynamic habitats. Research and surveys of historical occurences are also needed to determine if this species might be more common in limestone lakeside habitats.
In New York all known occurences of this species are on lake or river islands and shorelines, most often at sites with high-energy flooding, deposition, or ice-scouring disturbance regimes that inhibit soil development. Mixed deposits of sand and coarse gravel form the substrate, and dwarf sand cherry often is found growing in habitats with little other vegetation. On islands in large, fast-flowing rivers these site are often prairie-like habitats with tall grasses such as Panicum virgatum, Andropogon gerardii, and Sorghastrum nutans as dominants. (New York Natural Heritage Program 2007). Gravelly or sandy beaches and shores,especially in calcareous regions (Gleason and Cronquist 1991). Gravelly or sandy beaches in calcareous or basic soils or on calcareous pavement or slopes (Fernald 1970).
In New York dwarf sand cherry occurs in the Adirondacks and along Lake Champlain in the north, and along the Delaware River in the southern part of the state.
This plant is native in New Brunswick, Quebec, and New England, west to Ontario, Michigan, and Wisconsin, and as far south as Tennessee.
Dwarf sand cherry is a colonial shrub which produces creeping stems radiating outward from the original plant. The prostrate branches seldom produce growth over 30-40 cm high, but the stems may be 3 -5 meters long, and they root prolifically where they contact the ground. The simple leaves are long and narrow, 4 to 10 cm long, finely toothed, and glaucous (whitish) on the undersides. The creamy white to pinkish flowers, with petals only 4-8 mm long, are arranged in clusters of 2 to 4. These ripen to small, blackish, edible fruit. Like that of other cherry species, the bark smells of burnt almonds if scratched.
This plant may be identified in any season, though it might easily be overlooked in winter when the leaves are gone.
Prunus pumila var. depressa is distinctive among other Prunus species for its prostate, creeping growth form.
In vegetative form, this species may be mistaken for a willow (Salix), some species of which occupy the same habitats. If fruits and flowers are absent, it can be separated from all Salix species by its many-scaled buds, unlike willows' single-scaled buds, and by its bark, which like that other cherry species, smells like burnt almonds when scratched.
Dwarf sand cherry blooms in late May or early June, and the fruits may persist through August.
The time of year you would expect to find Dwarf Cherry vegetative, flowering, and fruiting in New York.
Prunus pumila var. depressa (Pursh) Gleason
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York. 910 pp.
Fernald, M.L. 1950. Gray's manual of botany. 8th edition. D. Van Nostrand, New York. 1632 pp.
Haines, Arthur and Thomas F. Vining. 1998. Flora of Maine. A Manual for Identification of Native and Naturalized Vascular Plants of Maine.
Holmgren, Noel. 1998. The Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the Vascular Plants of Northeastern United States and Adjacent Canada. The New York Botanical Garden, Bronx, New York.
New York Natural Heritage Program. 2010. Biotics database. New York Natural Heritage Program. New York State Department of Environmental Conservation. Albany, NY.
New York Natural Heritage Program. 2019. New York Natural Heritage Program Databases. Albany, NY.
Newcomb, Lawrence. 1977. Newcomb's Wildflower Guide: An Ingenious New Key System for Quick, Positive Field Identification of the Wildflowers, Flowering Shrubs, and Vines of Northeastern and North-Central North America. Little, Brown and Company. Boston.
Weldy, T. and D. Werier. 2010. New York flora atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research http://www.fccdr.usf.edu/. University of South Florida http://www.usf.edu/]. New York Flora Association http://newyork.plantatlas.usf.edu/, Albany, New York
Weldy, Troy W. and David Werier. 2005. New York Flora Atlas. [S.M. Landry, K.N. Campbell, and L.D. Mabe (original application development), Florida Center for Community Design and Research. University of South Florida]. New York Flora Association, Albany, NY. Available on the web at (http://newyork.plantatlas.usf.edu/).
Information for this guide was last updated on: December 4, 2007
Please cite this page as:
New York Natural Heritage Program. 2019. Online Conservation Guide for Prunus pumila var. depressa. Available from: https://guides.nynhp.org/dwarf-cherry/. Accessed February 17, 2019.