Mulgedium pulchellum
Blue lettuce
Image of Mulgedium pulchellum

Photo by Emmet J. Judziewicz 

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Key Characteristics

Tall forb (1 m) of Isle Royale; leaves elongate, mostly entire and unlobed; flowers blue, relatively large.

Status and Rank

  • State Status: X
  • State Rank: SX
  • Global Rank: G5T5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Keweenaw31930
Distribution map for Mulgedium pulchellum

Updated 1/31/2017. 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

In Michigan this species is native only to Isle Royale, where it occurs in rocky openings on ridges. It is adventive elsewhere in the state. In other portions of its range, this species inhabits moist prairies, meadows, clearings, and riverbanks. The Isle Royale populations have not been collected since 1930.

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

No data are available concerning associates in Michigan.

Management

A status survey on Isle Royale is recommended. This species may depend on natural disturbance such as prescribed fire to create successional habitat.

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 Jun 29, 2017]

References

Survey References

Technical References

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