Rhododendron canadense - (L.) Torr.
Rhodora
Other Common Names: rhodora
Taxonomic Status: Accepted
Related ITIS Name(s): Rhododendron canadense (L.) Torr. (TSN 23711)
Unique Identifier: ELEMENT_GLOBAL.2.128779
Element Code: PDERI15090
Informal Taxonomy: Plants, Vascular - Flowering Plants - Heath Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Ericales Ericaceae Rhododendron
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Rhododendron canadense
Conservation Status
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NatureServe Status

Global Status: G5
Global Status Last Reviewed: 13May2016
Global Status Last Changed: 29Aug1984
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G5 - Secure
Nation: United States
National Status: NNR
Nation: Canada
National Status: N5 (18Nov2017)

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Connecticut (S3S4), Maine (SNR), Massachusetts (SNR), New Hampshire (SNR), New Jersey (S1), New York (S2), Pennsylvania (SNR), Rhode Island (S2), Vermont (SNR)
Canada Labrador (SU), New Brunswick (S5), Newfoundland Island (S5), Nova Scotia (S5), Ontario (S1), Prince Edward Island (S5), Quebec (S4S5)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: The plant ranges from Newfoundland and Quebec west to Ontario, and south to eastern Pennsylvania and northern New Jersey.

Area of Occupancy: 2,501 to >12,500 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: > 300

Number of Occurrences with Good Viability/Integrity: Very many (>125)

Overall Threat Impact: Low

Short-term Trend: Relatively Stable (<=10% change)

Long-term Trend: Decline of <30% to increase of 25%

Environmental Specificity: Moderate. Generalist or community with some key requirements scarce.

Other NatureServe Conservation Status Information

Distribution
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Global Range: The plant ranges from Newfoundland and Quebec west to Ontario, and south to eastern Pennsylvania and northern New Jersey.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CT, MA, ME, NH, NJ, NY, PA, RI, VT
Canada LB, NB, NF, NS, ON, PE, QC

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CT Hartford (09003), New Haven (09009)*, Tolland (09013)
NJ Middlesex (34023)*, Morris (34027)*, Sussex (34037), Warren (34041)*
NY Essex (36031), Franklin (36033), Herkimer (36043)*, Orange (36071), St. Lawrence (36089), Ulster (36111), Warren (36113)*
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
01 Lower Connecticut (01080205)+, Farmington (01080207)+, Shetucket (01100002)+, Quinnipiac (01100004)+*
02 Upper Hudson (02020001)+*, Sacandaga (02020002)+*, Mohawk (02020004)+*, Middle Hudson (02020006)+*, Rondout (02020007)+, Raritan (02030105)+*, Middle Delaware-Mongaup-Brodhead (02040104)+, Middle Delaware-Musconetcong (02040105)+
04 Upper St. Lawrence (04150301)+, St. Regis (04150306)+, Ausable River (04150404)+*, Saranac River (04150406)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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General Description: Rhodora is a woody shrub with ascending branches that only grows up to 1.5 meters tall. It can be seen as a single shrub or in small to very large colonies. The flowers appear when the leaves are just expanding. Each branch is topped by a cluster of four or five deep rose colored flowers with long stamens sticking out. The three main petals are divided nearly to the white-colored base and the upper petal has three lobes on the top. Since there is no flower tube the flower appears very open. The oval, deciduous leaves are 2-5 cm long, fuzzy underneath, and mainly at the ends of the branches. The dry woody fruits are whitish, fuzzy, and split open along the sides into five sections.
Habitat Comments: A shrub that may form dominant stands or only a few scattered stems in wetlands of acidic rocky summits and barrens, as well as boggy habitats containing a mixture of organic material and gravel (New York Natural Heritage Program 2004). Bogs and wet woods (Gleason and Cronquist 1991). Bogs, damp thickets, acid barrens and rocky summits and slopes (Fernald 1970).
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 15Feb2005
NatureServe Conservation Status Factors Author: Weldy, Troy W.
Element Ecology & Life History Edition Date: 15Feb2005
Element Ecology & Life History Author(s): Weldy, T.

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Argus, G.W., K.M. Pryer, D.J. White and C.J. Keddy (eds.). 1982-1987. Atlas of the Rare Vascular Plants of Ontario.. Botany Division, National Museum of National Sciences, Ottawa.

  • Brunton D. F. 1992. Life Science Areas of Natural and Scientific Interest in Site District 6-12: A Review and Assessment of Significant Natural Areas. Ontario Ministry of Natural Resources, Eastern Region, Kemptville.

  • Cuddy, D.G. 1983. Alfred Bog. Trail & Landscape 17: 145-163.

  • Fernald, M.L. 1950. Gray's manual of botany. 8th edition. D. Van Nostrand, 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.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • 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.

  • Mosquin, T. 1991. The Alfred Bog: An Ecological Study. Nature Conservancy of Canada, Toronto. viii + 124 pp.

  • New York Natural Heritage Program. 2010. Biotics database. New York Natural Heritage Program. New York State Department of Environmental Conservation. 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.

  • Soper, J.H. and M.L. Heimburger. 1982. Shrubs of Ontario. Royal Ontario Museum, Toronto. 495 pp.

  • 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://wwws.nyflora.org/, Albany, New York

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Citation for Bird Range Maps of North America:
Ridgely, R.S., T.F. Allnutt, T. Brooks, D.K. McNicol, D.W. Mehlman, B.E. Young, and J.R. Zook. 2003. Digital Distribution Maps of the Birds of the Western Hemisphere, version 1.0. NatureServe, Arlington, Virginia, USA.

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