Coleataenia rigidula

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Common Names: Redtop Panic Grass; Dense Panic Grass

Coleataenia rigidula
Coleataenia rigidula AFP.jpg
Photo by the Atlas of Florida Plants Database
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Liliopsida - Moncots
Order: Cyperales
Family: Poaceae
Genus: Coleataenia
Species: C. rigidula
Binomial name
Coleataenia rigidula
(Bosc ex Nees)
Natural range of Coleataenia rigidula from Weakley [1]

Taxonomic Notes

Synonyms: Coleataenia longifolia (Torrey) Soreng ssp. rigidula (Bosc ex Nees) Soreng; Sorengia longifolia (Torrey) Zuloaga & Morrone ssp. rigidula (Bosc ex Nees) Zuloaga & Morrone; Panicum agrostoides Sprengel var. condensum (Nash) Fernald; P. rigidulum; P. rigidulum Bosc ex Nees ssp. rigidulum; P. agrostoides; P. condensum Nash; P. rigidulum var. rigidulum; P. rigidulum Bosc ex Nees var. condensum (Nash) Mohlenbrock; P. agrostoides var. agrostoides; P. agrostoides var. ramosius (C. Mohr) Fernald.

Varieties: none.[2]

Subspecies: C. rigidula (Bosc ex Nees) LeBlond ssp. condensa (Nash) LeBlond; C. rigidula (Bosc ex Nees) LeBlond ssp. rigidula.[2]


C. rigidula is a perennial grass of the Poaceae family that is native to North America.[3] C. rigidula ssp. condensa is easily identified by its compact inflorescence and tall stature. This subspecies can also resemble C. anceps ssp rhizomata, and can be differentiated by having sheaths that are smooth to distally appressed pubescent.[1]


C. rigidula can be found across the eastern side of North America and along the western coast of the United States and Canada. [3] C. rigidula ssp. condensa can be found in the Coastal Plain from southeast Massachusetts south to Florida and west to southeast Texas as well as disjunct in the West Indies, while C. rigidula ssp. rigidula can be found across the rest of its native range.[1]



Common areas C. rigidula can be found include marshes, meadows, peaty or wet sandy soils in low woods, shores of streams and ponds, swamps, ditches, and it can often be quite weedy.[1] Ideal habitat for C. rigidula is in moist regions, for instance, wooded floodplains, marshes, moist loamy sand at edge of woods, moist depressions, lower tidal hammock, swamp forests, pine flatwoods, edge of rivers, bottomland of wooded areas, and shores of lakes. [4]

Associated species include Taxodium distichum, Sabal palmetto, Pinus taeda, Pinus palustris, Osmunda cinnamomea, Berchemia sp., Polygonum sp., Fraxinus sp., Acer sp., Amelopsis sp., Hydrocotyle sp., Ilex vomitoria, Aristida sp., Toxicodendron sp., and Vaccinium fuscatum.[4]


This species has been observed to flower in December.[5]

Conservation, cultivation, and restoration

It is listed as a species of special concern by the Rhode Island Department of Environmental Management.[3]

Cultural use

Photo Gallery

References and notes

  1. 1.0 1.1 1.2 1.3 Weakley, A. S. (2015). Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC, University of North Carolina Herbarium.
  2. 2.0 2.1 Weakley, A.S. 2015. Flora of the southern and mid-atlantic states. Working Draft of 21 May 2015. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
  3. 3.0 3.1 3.2 USDA Plant Database
  4. 4.0 4.1 URL: Last accessed: June 2018. Collectors: Loran C. Anderson, Cecil R. Slaughter, M.Darst, H. Light, L. Peed, D.L. Martin, S. T. Cooper, J.B. McFarlin, R. Kral, F.C. Craighead, R.K. Godfrey, Richard Houk, John Palis, Sandy Thompson, J.P. Gillespie, Sydney Thompson, Culver Gidden, R.J. Eaton, Olga Lakela, A.F.Clewell, Robt. Blaisdell, Gary R. Knight, Keith Bradley. States and counties: Florida (Franklin, Oscelola, Wakulla, Levy, Madison, Marion, Hardee, Brevard, Dade, Charlotte, Pinellas, Dixie, Putnam, Santa Rosa, Liberty, Gadsden, Leon, Jefferson, Suwannee, Washington, Hamilton, Calhoun, Nassau, Collier, Gulf, Taylor) South Carolina (Laurens)
  5. Nelson, G. PanFlora: Plant data for the eastern United States with emphasis on the Southeastern Coastal Plains, Florida, and the Florida Panhandle. Accessed: 8 APR 2019