Gratiola aurea
Image of Gratiola aurea

Photo by Kitty Kohout 

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Key Characteristics

Small aquatic forb (10-30 cm) of mucky lakeshores in the Upper Peninsula; submerged plants with unbranched swollen stems and short (5 mm) opposite linear leaves; emergent plants with sessile leaves dotted with glands; flowers yellow, tubular.

Status and Rank

  • State Status: T
  • State Rank: S1S2
  • Global Rank: G5


County NameNumber of OccurrencesYear Last Observed
Distribution map for Gratiola aurea

Updated 5/15/2018. 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.


Occurs in shallow water and along sandy shores of soft water ponds and lakes.

Natural Community Types


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

Waterwort, water horsetail, northern manna grass, pondweed (Potamogeton oakesianus), water-milfoil (Myriophyllum tenellum), and water lobelia.


This species requires protection of lakeshores and ponds from excessive development and recreational uses that would directly impact populations or adversely affect habitat through degradation of water quality and modification of hydrological regime.

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 [Accessed Sep 23, 2018]


Survey References

Technical References

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