Clematis occidentalis
Purple clematis
Image of Clematis occidentalis

Photo by Bradford S. Slaughter 

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Key Characteristics

Perennial climbing vine of rocky woods, glades, and cliffs in the Upper Peninsula; leaves divided into 3 ovate leaflets; flowers pinkish-purple on long stalks.

Status and Rank

  • State Status: SC
  • State Rank: S3
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Baraga22009
Dickinson21992
Gogebic32004
Houghton22005
Iron22015
Keweenaw262014
Marquette52008
Ontonagon42012
Schoolcraft11981
Distribution map for Clematis occidentalis

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

Found in rocky openings within a variety of forest types in the western Upper Peninsula. It also occurs along bedrock shorelines of Lake Superior and in open areas on Isle Royale.

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

Big leaf aster, buffaloberry, shadbush, Canada mayflower, alum root, wild columbine, white and red pine, early meadow rue, ricegrass, cow wheat, clubmoss, bunchberry, and honeysuckle.

Management

Protect habitat and natural disturbance (fire, wind throw) regime.

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 Aug 21, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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