More business resources
- Share your observations
-
Share your observations of plants or non-game animals with the Natural Heritage Inventory.
Help care for rare plants and animals by ordering an Endangered Resources plate.
- Contact information
- For information on Wisconsin's rare plants, contact:
- Kevin Doyle
608-416-3377
Mamillate Spike-rush (Eleocharis mamillata)
Life history
Species overview
Mamillate Spike-rush (Eleocharis mamillata), a Wisconsin Special Concern plant, is found on the edge between wet meadow and shrub-carr and on sphagnum-sedge bog mat in Wisconsin. Rangewide, it has been found on fresh lakeshores, shallow ponds, streams, floating mats, bogs, fens, and ditches. Blooming occurs mid-May through late August; fruiting occurs mid-June through late September. The optimal identification period for this species is mid-June through late September.
Synonyms: None
Identification
- Distinguishing characteristics: Often confused with E. palustris and E. macrostachya. They are differentiated by perianth (flower) bristles and achenes.
- Flower characteristics: Perianth (flower) bristles (4-) 5 to 6 (-8), brown, slender to stout, mostly exceeding the tubercles, to twice as long as the achene; stamens 3.
- Fruit characteristics: Achenes not persistent, yellow maturing to straw-colored, biconvex with obscure angles, apex rounded with no neck; tubercles brown to partly white.
- Leaf characteristics: Distal leaf sheaths persistent, often splitting away from the stem, usually reddish close to the stem and turning to straw-colored further from the stem.
Phenology
- Blooming phenology: mid-May through late August
- Fruiting phenology: mid-June through late September
- Optimum time to identify: The optimal identification period for this species is mid-June through late September
Other
- Growth form: Graminoid
- Vegetative reproduction: Rhizomatous
- Life cycle: Perennial
- Comments: Associated Species: Salix gracilis, Alnus rugosa, Carex lacustris, Cyperus cyperinus.
State status
Status and Natural Heritage Inventory documented occurrences in Wisconsin
The table below provides information about the protected status - state and federal - and the rank (S and G Ranks) for Mamillate Spike-rush (Eleocharis mamillata). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where this species has been found to date and is not meant as a range map.
| Summary Information | |
|---|---|
| State Status | SC |
| Federal Status in Wisconsin | none |
| State Rank | S1 |
| Global Rank | G5 |
| Tracked by NHI | Y |
Habitats and landscapes
The Natural Heritage Inventory has developed scores indicating the degree to which each of Wisconsin's rare plant species is associated with a particular natural community or ecological landscape. This information is similar to that found in the Wildlife Action Plan for animals. As this is a work in progress, we welcome your suggestions and feedback.
General habitat information
- Habitat description: Found on the edge between wet meadow and shrub-carr and on sphagnum-sedge bog mat in Wisconsin. Rangewide, it has been found on fresh lakeshores, shallow ponds, streams, floating mats, bogs, fens, and ditches.
- Soils: Moist to wet soils.
Natural communities
This table lists the natural communities that are associated with Mamillate Spike-rush. Scores for natural community associations are: "significant" association (score=3), "moderate association" (score=2) or the species can be present but is only weakly associated with the community (score=1).
| Natural communities | score |
|---|---|
| Northern Sedge Meadow | 3 |
Ecological landscapes
This table lists the ecological landscape association scores for Mamillate Spike-rush. The scores (3=High, 2=Moderate, 1=Low, 0=None) also correspond to the map.
Species guidance
The Endangered Resources Program has developed avoidance measures and management guidelines for plants on the Natural Heritage Working List. These are a work in progress, and we welcome your suggestions and feedback. Sources used in developing this information can be found here.
Avoidance measures
These are specific actions designed to avoid "take" (mortality) of this species.
- Avoid broadcast spraying of herbicides; use care with spot spraying.
- Avoid known individual plant locations and conduct operations elsewhere when they are least likely to cause damage. Ideally, this would involve frozen, snow-covered ground. However, in areas of the state where frozen conditions are unreliable, very dry soils late in the growing season might be the best available alternative. Consult with a biologist, if needed.
Management guidance
Management guidelines are additional considerations that may help maintain or enhance habitat for this species
- Maintain and restore open habitat through selective clearing and brushing.
- Prescribed burns and/or brushing may be beneficial (dependent on local site conditions).
- Minimize disturbance to hydrology, including soil disturbance from rutting.
Other resources
Links to additional Mamillate Spike-rush information
Other links related to vascular plants (all exit the DNR website)
- Wisconsin Flora
- NatureServe Explorer
- Atlas of Wisconsin Prairie and Savanna Flora - Wisconsin State Herbarium
- USDA - NRCS Plants Database
- USGS Midwestern Wetland Flora - field office guide to plant species
- eFloras
- Cofrin Center for Biodiversity Herbarium
- Intermountain Herbarium Grasses of North America
- Orchids of Wisconsin
Photos
Click to view a larger version. Please considering donating a photo to the Natural Heritage Conservation Program for educational uses. Photo use
-
Specimen scanned by the Wisconsin Herbarium, Madison, WI.
Scanned specimen courtesy of Wisconsin Herbarium
Support for Wisconsin's rare plant information has been provided by the Division of Forestry, the Endangered Resources Fund and the Wisconsin Rare Plant Preservation Fund. To donate, visit the Natural Resources Foundation of Wisconsin [exit DNR].
