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Wilcox's Panic Grass (Dichanthelium wilcoxianum)


Life history

Species overview

Wilcox's Panic Grass (Dichanthelium wilcoxianum), a State Special Concern plant, is found in dry, gravelly hillside prairies. Blooming occurs late May through early June; fruiting occurs late June through late July. The optimal identification period for this species is late June through late July.

Synonyms: Panicum wilcoxianum var. breitungii, Dichanthelium oligosanthes var. wilcoxianum, Dichanthelium wilcoxianum

Identification

  • Distinguishing characteristics: Distinguished from many other similar species by its pilose internodes.
  • Flower characteristics: Panicle 2 to 5 cm long; spikelets to 3 mm long, papillose-pubescent.
  • Fruit characteristics:
  • Leaf characteristics: Sheaths and blades copiously papillose-hirsute; ligule 1 mm long; blades firm, erect, 5 to 8 cm long, usually involute-acuminate.

Phenology

  • Blooming phenology: late May through early June
  • Fruiting phenology: late June through late July
  • Optimum time to identify: late June through late July

Other

  • Growth form: Graminoid
  • Vegetative reproduction:
  • Life cycle: Perennial
  • Comments: Associated Species: Asclepias verticillata, Aster sericeus, Solidago nemoralis, S. rigida, other Panicum species, Liatris aspera, Kuhnia eupatorioides, Ratibida pinnata.

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 Wilcox's Panic Grass (Dichanthelium wilcoxianum). 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 Dichanthelium wilcoxianum in the Natural Heritage Inventory Database as of March 2012.

Summary Information
State StatusSC
Federal Status in Wisconsinnone
State RankS1
Global RankG5
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 dry, gravelly hillside prairies.
  • Soils: Dry, gravelly soils.

Natural communities

This table lists the natural communities that are associated with Wilcox's Panic Grass. 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

Ecological landscapes

This table lists the ecological landscape association scores for Wilcox's Panic Grass. 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

  • Maintain and restore open habitat through selective clearing and brushing.
  • Prescribed burns and/or brushing may be beneficial (dependent on local site conditions).

Photos


Wilcox's Panic Grass  [Photo #23882]

Photo ©  USDA-NRCS.

Wilcox's Panic Grass  [Photo #1877]

Specimen scanned by the Wisconsin Herbarium, Madison, WI.

Photo ©  Wisconsin Herbarium.

Wilcox's Panic Grass  [Photo #1876]

Specimen scanned by the Wisconsin Herbarium, Madison, WI.

Photo ©  Wisconsin Herbarium.

Wilcox's Panic Grass  [Photo #1879]

Specimen scanned by the Wisconsin Herbarium, Madison, WI.

Photo ©  Wisconsin Herbarium.

Wilcox's Panic Grass  [Photo #1878]

Specimen scanned by the Wisconsin Herbarium, Madison, WI.

Photo ©  Wisconsin Herbarium.

Wilcox's Panic Grass  [Photo #1881]

Specimen scanned by the Wisconsin Herbarium, Madison, WI.

Photo ©  Wisconsin Herbarium.

Wilcox's Panic Grass  [Photo #1880]

Specimen scanned by the Wisconsin Herbarium, Madison, WI.

Photo ©  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].

Last revised: Monday, July 21, 2014
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