This is the only juneberry in New York with flowers that produce pollen on the edges of the petals. It was first described from plants on Nantucket Island in Massachusetts by botanist Eugene Bicknell in 1911 (Bicknell 1911).
There are three known populations on Long Island and one on Staten Island that is under threat. The largest population has about 200 plants. There is one additional old record at Montauk Point that has not been surveyed.
The short-term trend seems stable on Long Island, but the plants are under threat, if not extirpated, on Staten Island because of building construction.
The long-term trend is probably stable on Long Island, because almost all populations are in protected areas, even though they are subject to occasional destructive disturbance along a power line at one site. The 2 small populations on Staten Island have declined and may be gone.
On Staten Island the development of a hotel complex has threatened the plants. On Long Island there are plants along a powerline right-of-way and a railroad that are occasionally subject to destructive disturbance when there is maintenance of the right-of-ways.
Maintain a buffer around plants to prevent direct destruction or poisoning from herbicides. Maintain succession in an early stage to prevent competition from larger shrubs and trees.
More research is needed to document the range of flower and vegetative variability of the plants on Long Island.
In New York, Nantucket Juneberry grows on sandy soils in a variety of coastal habitats. It has been found growing alongside maritime grasses, in shrubby, heath-dominated areas, and with oaks and pitch pines in woodlands and forest openings (New York Natural Heritage Program 2009). Dry, open areas (Haines 1998). Dry moors, pine-barrens and pond margins (Fernald 1970).
This shrub is known from the South Fork of Long Island where it is very local, and from a small area of Staten Island that is under pressure from development.
Amelanchier nantucketensis has a small range, with most occurrences on Nantucket and Martha's Vineyard Islands, Massachusetts; and a few additional sites on Long Island and Staten Island, New York; at Great Falls, Maryland; and in Maine and Nova Scotia.
Nantucket Juneberry is a colonial shrub, growing up to 2.5 meters (but usually much shorter, up to knee height), often with many stems growing close together. At flowering time, the leaves are still partially folded lengthwise and hairy underneath. The inflorescences are erect racemes of 7 to 10 flowers. The petals are white, spoon-shaped, 3-4 mm long (short for NY Amelanchier species), and have the unusual characteristic known as andropetaly, meaning that some of the petals produce pollen (FNA 2008). Flowering stems are needed to positively identify Nantucket Juneberry.
Nantucket Juneberry can only be positively identified when flowering.
Amelanchier nantucketensis was previously considered a hybrid between A. canadensis and A. spicata. Both of those species are taller and have larger petals which do not produce pollen. Amelanchier stolonifera is the species that most looks like A. nantucketensis. It is short but usually above knee height and the petals are oblong or narrowly obovate, 7-9 mm long and without pollen sacs. It is impossible to definitively distinguish the two species when not in flower.
Flowers open the first to second week of May and fruits persist to mid-summer. Must be identified while flowering.
The time of year you would expect to find Nantucket Juneberry flowering in New York.
Amelanchier nantucketensis Bickn.
Haines, Arthur and Thomas F. Vining. 1998. Flora of Maine. A Manual for Identification of Native and Naturalized Vascular Plants of Maine.
Bicknell, Eugene P. 1911. The ferns and flowering plants of Nantucket-VIII. Bulletin of the Torrey Botanical Club 38 (10): 447-460.
Crow, Garrett E. 1982. New England's Rare, Threatened, and Endangered Plants. Prepared for the United States Department of Interior, Fish and Wildlife Service, Northeast Region. June 1982.
Dibble, Alison C. and Christopher S. Campbell. 1995. Distribution and conservation of Nantucket shadbush, Amelanchier nantucketensis (Rosaceae). Rhodora 97(892): 39-349.
Dibble, Alison C. and Francis A. Drummond. 1997. Floral syndrome in Amelanchier nantucketensis (Rosaceae). 1. Floral density, bee activity, and characterization of andropetaly.
Fernald, M. L. 1950. Gray's manual of botany. 8th edition. Corrected printing (1970). D. Van Nostrand Company, New York. 1632 pp.
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.
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.
Mitchell, Richard S. and Gordon C. Tucker. 1997. Revised Checklist of New York State Plants. Contributions to a Flora of New York State. Checklist IV. Bulletin No. 490. New York State Museum. Albany, NY. 400 pp.
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. 2020. New York Natural Heritage Program Databases. Albany, NY.
Reschke, Carol. 1990. Ecological communities of New York State. New York Natural Heritage Program, New York State Department of Environmental Conservation. Latham, NY. 96 pp. plus xi.
Seymour, F.C. 1989. The flora of New England. A manual for the identification of all vascular plants including ferns and their allies growing without cultivation in New England. Boston Museum Science, Boston. 611 pp. + appendix.
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
This guide was authored by: Stephen M. Young
Information for this guide was last updated on: April 11, 2011
Please cite this page as:
New York Natural Heritage Program. 2020. Online Conservation Guide for Amelanchier nantucketensis. Available from: https://guides.nynhp.org/nantucket-juneberry/. Accessed September 30, 2020.