Agalinis skinneriana
Skinner's gerardia
Image of Agalinis skinneriana

Photo by Susan R. Crispin 

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Key Characteristics

Annual forb (20-50 cm) of lakeplain prairies; stem slender with sparse, strongly ascending branches, bearing linear opposite leaves; flowers white to light pink arising on long stalks (7-30 mm) from leaf axils on the upper main stem.

Status and Rank

  • State Status: E
  • State Rank: S1
  • Global Rank: G3G4

Occurrences

County NameNumber of OccurrencesYear Last Observed
St. Clair11994
Distribution map for Agalinis skinneriana

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

Found in lakeplain prairie landscapes.

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.

Feel free to send questions and comments to Brad Slaughter at slaugh14@msu.edu.

Associated Plants

Bluejoint grass, cordgrass, rush, sedges, twig-rush, shrubby cinquefoil, swamp milkweed, big bluestem, Indian grass, Sullivant's milkweed, purple milkweed, swamp thistle, eastern prairie fringed orchid, marsh blazing star, whorled loosestrife, grass-of-Parnassus, smooth hedge nettle, swamp rose, Missouri ironweed, little bluestem, three-awned grass, colic root, prairie willow, seedbox, and short-fruited rush.

Management

Maintain hydrological and natural disturbance regimes. This species most likely requires open conditions. Prevent woody plant encroachment by using prescribed fire or manual brush removal. Soil disturbance also may be needed. Much of this habitat has been lost and degraded via conversion to agriculture, development, alterations of hydrology via drains and also through fire suppression.

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement 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 Apr 24, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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