- Contact information
- For information on Wisconsin's rare plants, contact:
- Kevin Doyle
Hairy Wild-petunia (Ruellia humilis)
Hairy Wild-petunia (Ruellia humilis), a State Endangered plant, is found in prairies and upland oak woods. Blooming occurs late May through early October; fruiting occurs late June through early October. The optimal identification period for this species is late May through early October.
Synonyms: Ruellia ciliosa var. longiflora, Ruellia humilis var. calvescens, Ruellia humilis var. depauperata, Ruellia humilis var. expansa, Ruellia humilis var. frondosa, Ruellia humilis var. humilis, Ruellia humilis var. longiflora
- Distinguishing characteristics: Leaves sessile or subsessile; petiole, if any, less than 3 mm; fruit smooth.
- Flower characteristics: Flowers in sessile or subsessile, crowded cymose clusters from the axils of several upper leaves; calyx lobes less than 1 mm wide; corolla blue-lavender, 3 to 7 cm, funnelform, 5-lobed; stamens 4, weakly united in pairs toward the base, the lower pair somewhat longer.
- Fruit characteristics: Smooth.
- Leaf characteristics: Opposite, sessile or subsessile, 3 to 8 cm long, acute to very obtuse.
- Blooming phenology: late May through early October
- Fruiting phenology: late June through early October
- Optimum time to identify: late May through early October
- Growth form: Forb-erect
- Vegetative reproduction:
- Life cycle: Perennial
- Comments: Associated Species: Andropogon scoparius, Euphorbia corollata, Lithospermum canescens, Petalostemum purpureum, Ratibida pinnata, Lespedeza capitata, Helianthus occidentalis.
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 Hairy Wild-petunia (Ruellia humilis). 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 in prairies and upland oak woods.
- Soils: Sandy, loamy soils.
This table lists the natural communities that are associated with Hairy Wild-petunia. 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).
This table lists the ecological landscape association scores for Hairy Wild-petunia. 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
- Maintain and restore open habitat through selective clearing and brushing.
- Prescribed burns and/or brushing may be beneficial (dependent on local site conditions).
Links to additional Hairy Wild-petunia information
Other links related to vascular plants (all exit the DNR website)
- Wisconsin Vascular Plants
- Freckmann Herbarium
- 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.