Hypericum sphaerocarpum
Round-fruited St. John's-wort

Key Characteristics

Perennial forb (70 cm) of moist prairies; stems clustered, somewhat woody at base; leaves elliptic (3-6 cm long), with a single primary midvein; flowers yellow, borne in compact, branched clusters; fruit globose .

Status and Rank

  • State Status: E
  • State Rank: S1
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Monroe11983
Distribution map for Hypericum sphaerocarpum

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

Collected only once in Michigan (1983) in openings of shrub thickets along the upper banks of a small tributary creek near Lake Erie. Also found nearby in Ohio, it is at the extreme northeast portion of its range.

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

Willow and dogwood.

Management

Information on this species consists only of very limited collection data, and the plant was not found during a revisit of the site by the original collector. Status survey in southeastern as well as southwestern Lower Michigan is recommended. Protection of hydrology and natural disturbance regimes are likely important for this species.

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 Jul 20, 2017]

References

Survey References

Technical References

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