Strophostyles helvula
Trailing wild Bean
Image of Strophostyles helvula

Photo by Susan R. Crispin 

Key Characteristics

Low, twining to trailing annual vine (up to 1 m) of open, moist, sandy soil; alternate trifoliate leaves sparsely hairy beneath, the leaflets often with a coarse lobe on one side; producing peduncles from leaf axils that are few-flowered, bearing pinkish, pea-like flowers and greenish pods that are coiled after seed dispersal.

Status and Rank

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

Occurrences

County NameNumber of OccurrencesYear Last Observed
Allegan12002
Berrien51981
Kent11979
Monroe102015
Muskegon11961
Ottawa11918
Van Buren11880
Washtenaw11924
Wayne42014
Distribution map for Strophostyles helvula

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

Trailing wild bean is found in sandy soil, thickets on disturbed ground, roadsides, ditch banks, beaches, and dunes.

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

Water-plantain, sedges, spike-rush, northern manna grass, cut grass, smartweed, arrowhead, bur-reed, cat-tail, wild rice, water-milfoil, watercress, great duckweed, water-lily, bulrush, pickerel weed, arrow-arum, pondweed, little bluestem, big bluestem, colic root, wild indigo, common horsetail, path rush, hairy pinweed, pale spiked lobelia, mountain mint, meadowsweet, tall goldenrod, bulrush.

Management

To preserve this species, protect habitat and maintain wetland hydrology and natural cycle of fluctuations in emergent marsh. Agricultural run-off has negative impacts. Protect habitat from development.

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 May 28, 2017]

References

Survey References

Technical References

Facebook link