Torrey's Sedge (Carex torreyi)

Life history

Species overview

Torrey's Sedge (Carex torreyi), a Wisconsin Special Concern plant, is found in dry dolomite prairies on the St. Croix and Mississippi Rivers, as well as in white oak savannas in southeast Wisconsin. Blooming occurs late May through early June; fruiting occurs early June through early July. The optimal identification period for this species is late June through early July.

Synonyms: Carex abbreviata

Identification

• Distinguishing characteristics: Cespitose; leaves and sheaths pubsescent; terminal spikelet usually staminate; perigynia ovate or obovate, glabrous, strongly 15 to 25 veined, abruptly tipped with a short, toothless beak.
• Flower characteristics: Lateral spikes approximate or proximal distant; terminal spike staminate or, rarely, pistillate with not more than 1 to 4 female flowers.
• Fruit characteristics: Perigynia ascending, strongly 15 to 25-veined, ovate or obovate, glabrous, appruptly tipped with a short (0.2 to 0.5 mm long), toothless beak.
• Leaf characteristics: Sheaths pubescent; ligules longer than wide; blades pubescent.

Phenology

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

Other

• Growth form: Graminoid
• Vegetative reproduction: Rhizomatous
• Life cycle: Perennial
• Section: Porocystis
• Comments: Associated Species: Quercus alba, Lathyrus ochroleucus, Carex pensylvanica, Luzula multiflora.

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 Torrey's Sedge (Carex torreyi). 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.

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 dolomite prairies on the St. Croix and Mississippi Rivers, as well as in white oak savannas in southeast Wisconsin.
• Soils: Calcareous soils.

Natural communities

This table lists the natural communities that are associated with Torrey's Sedge. 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).

Ecological landscapes

This table lists the ecological landscape association scores for Torrey's Sedge. 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 locating landings, staging areas, or access routes in open sandy areas dominated by native grasses.
• 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).

Other resources

Links to additional Torrey's Sedge 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