PROTECTING WISCONSIN'S BIODIVERSITY

 
 
   
 
Scientific Name Common Name Global Rank State Rank Federal Status WI Status

Ovate Beak Grass (Diarrhena obovata)

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Photo by Emmet Judziewicz

 

Counties with Mapped NHI Occurrences

Ovate Beak Grass (Diarrhena obovata), a Wisconsin Endangered plant, is found in moist streamside deciduous forests. Blooming occurs early-August through early-September, fruiting early-September through early-October. The optimal identification period for this species is early-August through early-October.

Diarrhena americana, Diarrhena americana var. obovata

 
 
 

Ovate beak grass is cespitose with mostly basal leaves. Inflorescence 10-30cm long and drooping. Spikelets are flattened by the spreading of the lemmas. 3-5-flowered, panicle is scabrous, long, slender, and few-flowered. First glume is triangular, 1.9-2.8mm, second glume is oblong, cuspidate, 2.4-4.3mm. Lemmas 5.2-6.8mm, abruptly rounded into a short cusp, smooth; callus glabrous. Grains are large. Sheaths are pubescent toward the top, blades are 20-40cm long, 10-18mm wide, with mid vein off-center.

Glumes and lemmas shorter than in D americana var americana.

Rhizomatous and densely clonal. Blooming occurs early-August through early-September, fruiting early-September through early-October.

Perennial. The optimal identification period for this species is early-August through early-October.

Associated species include Fraxinus pennsylvanica, Ulmus americana, Acer saccharinum, Quecus bicolor, and Celtis occidentalis.

Ovate beak grass is found in moist streamside deciduous forests.

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 and use care with spot spraying.

Follow BMPs, especially around streams and use care near ravines, steep slopes, cliffs, rock outcrops, etc.

This species requires shaded habitat conditions, maintain high forest canopy cover.

Minimize disturbance to hydrology, including soil disturbance from rutting.

Species of Greatest Conservation Need (SGCN) are associated with habitats (or natural communities) and places on the landscape. Understanding relationships among SGCN, natural communities and ecological landscapes help us make decisions about issues affecting SGCN and their habitat and how to respond. Download the Wildlife Action Plan association score spreadsheet to explore rare species, natural communities and ecological landscape associations

Conservation actions respond to issues or threats, which adversely affect species of greatest conservation need (SGCN) or their habitats. Besides actions such as restoring wetlands or planting resilient tree species in northern communities, research, surveys and monitoring are also among conservation actions described in the Wisconsin Wildlife Action Plan because lack of information can threaten our ability to successfully preserve and care for natural resources.