Regularity: Regularly occurring
Global Range: Only known occurrence is from the shore of a lake in Washtenaw County, Michigan.
Comments: Swamps and edges of bogs and lakes in southern Michigan.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 1 - 5
Comments: One occurrence located on University of Michigan's forest properties, in Washtenaw County in southern Michigan.
Life History and Behavior
National NatureServe Conservation Status
Rounded National Status Rank: N1 - Critically Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: G1 - Critically Imperiled
Reasons: Betula murrayana is known from a single naturally occurring site in Washtenaw County, Michigan. One one individual remains, of the two originally known there in the 1960's. Propagated plants are maintained in cultivation, and a few that were planted at the original site and another site have reached flowering size. The species may have recently evolved through hybridization.
Global Short Term Trend: Relatively stable (=10% change)
Comments: The one remaining individual has survived. Planted individuals at the site are maturing, and have flowered.
Global Long Term Trend: Increase of 10-25% to decline of 30%
Comments: Of the two plants originally known in the 1960's, only one survives. The species has been propagated from cuttings and seed, and a few planted individuals have reached flowering size, including a few reintroduced to the original site.
Degree of Threat: Very high - high
Comments: The population size is precariously small, with the species known from a single natural occurrence, but no particular other threats have been noted.
Names and Taxonomy
Comments: Fertile species formed through hybridization (Barnes and Dancik, 1985; Flora of North America, 1997).
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