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For information on Wisconsin's rare plants, contact:
Kevin Doyle

Narrow-leaved Dayflower (Commelina erecta var. deamiana)

Life history

Species overview

Narrow-leaved Dayflower (Commelina erecta var. deamiana), a Wisconsin Special Concern plant, is found in sand prairies and on sandstone outcrops, mostly along the lower Wisconsin River. Blooming occurs late June through early September; fruiting occurs late August through late September. The optimal identification period for this species is late June through early September.

Synonyms: Commelina erecta var. greenei


  • Distinguishing characteristics: Distinguished from C. communis by its tall, erect stem (not weak and arching upward from a low creeping stem), thickenend fibrous roots, and spathe with the margins connate on the lower third.
  • Flower characteristics: Flowers 3-petaled, solitary or in small clusters, borne in a spathe with the margins connate (joined) on the lower third; upper two petals, larger, 1 to 2.5 cm wide, and blue; lower petal smaller and whitish.
  • Fruit characteristics: Capsule, 3-locular although usually only 2 locules are smooth and dehiscent; seeds brown, smooth, 3 to 5 mm long.
  • Leaf characteristics: Linear or lance-shaped, 10 to 15 cm long, the base encirling the stem with a white hairy sheath.


  • Blooming phenology: late June through early September
  • Fruiting phenology: late August through late September
  • Optimum time to identify: The optimal identification period for this species is late June through early September


  • Growth form: Forb-erect
  • Vegetative reproduction:
  • Life cycle: Perennial
  • Comments: Associated Species: Juniperus virginiana, Monarda punctata, Tradescantia ohioensis, Andropogon scoparius.

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 Narrow-leaved Dayflower (Commelina erecta var. deamiana). 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.

Documented locations of Commelina erecta var. deamiana in the Natural Heritage Inventory Database as of July 2015.

Summary Information
State StatusSC
Federal Status in Wisconsinnone
State RankS1
Global RankG5T5
Tracked by NHIY

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 sand prairies and on sandstone outcrops, mostly along the lower Wisconsin River.
  • Soils: Dry, sandy soils.

Natural communities

This table lists the natural communities that are associated with Narrow-leaved Dayflower. 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
Dry Prairie 3
Sand Prairie 3
Oak Barrens 2

Ecological landscapes

This table lists the ecological landscape association scores for Narrow-leaved Dayflower. The scores (3=High, 2=Moderate, 1=Low, 0=None) also correspond to the map.

Map of the Ecological Landscapes of Wisconsin.

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 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.
  • Avoid locating landings, staging areas, or access routes in open sandy areas dominated by native grasses.

Management guidance

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.


Narrow-leaved Dayflower  Photo.

Photo by  staff, Wisconsin DNR.

Narrow-leaved Dayflower  Photo.

Photo © Kitty Kohout.

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].

Last revised: Friday, February 15, 2019
Southwest Savanna Southern Lake Michigan Coastal Western Coulees and Ridges Southeast Glacial Plains Central Sand Hills Central Lake Michigan Coastal Central Sand Plains Northern Lake Michigan Coastal Northern Lake Michigan Coastal Northeast Sands Western Prairie North Central Forest Northern Highlands Northwest Lowlands Northwest Sands Northwest Lowlands Superior Coastal Plains Forest Transition