Betula murrayana
Murray birch

Key Characteristics

Small tree of fertile polyploid origin from the hybrid purpus birch (B. Xpurpursii), a cross between bog birch (B. pumila) and yellow birch (B. alleghaniensis), all characters intermediate between the parent species.

Status and Rank

  • State Status: SC
  • State Rank: S1
  • Global Rank: G1Q

Occurrences

County NameNumber of OccurrencesYear Last Observed
Washtenaw11994
Distribution map for Betula murrayana

Updated 7/21/2017. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

Only one known remaining specimen of this fertile polyploid exists in the wild. It occurs in a low swampy area adjacent to a lake in southern Lower Michigan.

Natural Community Types

Methodology

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Associated Plants

Paper birch, dogwood, trembling aspen, bog birch, and yellow birch.

Management

Known globally from a single site in Washtenaw County. One of two documented individuals remains extant; further survey may turn up more individuals elsewhere in southeastern Michigan.

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgment of the investigator.

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Dec 18, 2017]

References

Survey References

Technical References

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