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Share your observations of plants or non-game animals with the Natural Heritage Inventory.
- Contact information
- For information on Wisconsin's rare plants, contact:
- Kevin Doyle
Scarlet Loosestrife (Ammannia robusta)
Scarlet Loosestrife (Ammannia robusta), a Wisconsin Special Concern plant, is found near edges of ponds, in grassy swales, and similar wet places. Blooming occurs July through September; fruiting occurs mid-August through mid-October. The optimal identification period for this species is mid-August through early October.
- Distinguishing characteristics: Can be distinguished from Rotala sp., by its larger and showier fruits as well as its arrangement of flowers, which are clustered in the axils in Ammannia but solitary in Rotala.
- Flower characteristics: Small, pale lavender, 1 to 3, born in leaf axils.
- Fruit characteristics: Capsule occassionaly dehiscent, globose.
- Leaf characteristics: Opposite, thick and fleshy, linear or narrowly oblong, clasping to perfoliate, up to 10 cm long and 1.5 cm wide.
- Blooming phenology: July through September
- Fruiting phenology: mid-August through mid-October
- Optimum time to identify: mid-August through early October
- Growth form: Forb-erect
- Vegetative reproduction:
- Life cycle: Annual
- Comments: Associated Species: Echinochloa crus-galli, Scirpus sp., Juncus sp., Cyperus esculentus, Eleocharis spp, Bidens spp.
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 Scarlet Loosestrife (Ammannia robusta). 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.
|Federal Status in Wisconsin||none|
|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 near edges of ponds, in grassy swales, and similar wet places.
- Soils: Wet soils.
This table lists the natural communities that are associated with Scarlet Loosestrife. 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).
|Southern Sedge Meadow||3|
This table lists the ecological landscape association scores for Scarlet Loosestrife. The scores (3=High, 2=Moderate, 1=Low, 0=None) also correspond to the map.
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.
These are specific actions designed to avoid "take" (mortality) of this species.
- 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.
- Avoid broadcast spraying of herbicides; use care with spot spraying.
Management guidelines are additional considerations that may help maintain or enhance habitat for this species
- Prescribed burns and/or brushing may be beneficial (dependent on local site conditions).
- Maintain and restore open habitat through selective clearing and brushing.
- Minimize disturbance to hydrology, including soil disturbance from rutting.
Links to additional Scarlet Loosestrife 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
- Cofrin Center for Biodiversity Herbarium
- Intermountain Herbarium Grasses of North America
- Orchids of Wisconsin
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.