Gratiola virginiana
Annual hedge hyssop

Key Characteristics

Small annual forb (40 cm) of wet prairies; leaves lanceolate, broadest above middle; flowers white with purple nectar guide lines, tubular, and borne on stout pedicels.

Status and Rank

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

Occurrences

County NameNumber of OccurrencesYear Last Observed
Berrien21991
Cass12003
Distribution map for Gratiola virginiana

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

Collected on periodically flooded sand flats in southwest Michigan, in sites well-known for many coastal plain disjunct species.

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

Panic grass (Panicum spretum), soft-stemmed rush, Canada rush, and marsh St. John's-wort, tooth-cup, grass-leaved arrowhead, waterpepper, and spike-rushes.

Management

A status survey is the primary need for this species. If found, it would likely require maintenance of the hydrological regime and protection from disturbances such as ORV impacts.

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 Dec 18, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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