small carpetgrass, joint-head grass USDA PLANTS Symbol: ARHI3
U.S. Nativity: Exotic
Habit: Grass or Grasslike
Arthraxon hispidus (Thunb.) Makino

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Taxonomic Rank: Liliopsida: Cyperales: Poaceae
Synonym(s): jointhead arthraxon, hairy jointgrass
Native Range: Temp. & trop. Asia, Australasia (GRIN);

Small carpetgrass is an annual grass that was introduced into the United States, either accidentally or by immigrants, from Japan and eastern Asia. The plant stands to 1.5 ft. (0.5 m) tall with oval to lance-shaped leaves. Leaves are 1-3 in. (2.5-7.6 cm) long, 1/5 in. (0.5 cm) wide and have heart shaped bases. The margins of the leaves have conspicuous hairs. Flowers bloom in early fall and are contained in 1 to several, 1-3 in. (2.5-7.6 cm) long spikes. Small carpetgrass inhabits wet areas such as stream banks, flood plains and shorelines.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Foliage; Close-up of leaves and stem
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Plant(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Infestation;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Feature(s); Clasping leaf bases
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Infestation;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Flower(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Root(s);
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Fruit(s);
Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org
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Plant(s); USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service.
USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org
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Plant(s); Hitchcock, A.S. (rev. A. Chase). 1950. Manual of the grasses of the United States. USDA Misc. Publ. No. 200. Washington, DC.
USDA PLANTS Database, USDA NRCS PLANTS Database, Bugwood.org
Additional Resolutions & Image Usage

Flower(s); inflorescence
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
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Foliage;
Leslie J. Mehrhoff, University of Connecticut, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.

U.S. National Parks where reported invasive:
Colonial National Historical Park (Virginia)
Harpers Ferry National Historical Park (West Virginia)
Monocacy National Battlefield Park (Maryland)
Rock Creek National Park (Washington, D.C.)



Invasive Listing Sources:
Connecticut Invasive Plant Working Group
Faith Campbell, 1998
Georgia Exotic Pest Plant Council
Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
Jil Swearingen, personal communication, 2009-2013
Kentucky Exotic Pest Plant Council
Maryland Department of Natural Resources, 1994
Mid-Atlantic Exotic Pest Plant Council, 2005
Mid-Atlantic Exotic Pest Plant Council, 2005
Pennypack Ecological Restoration Trust, Pennsylvania.
Tennessee Exotic Pest Plant Council
Virginia Department of Conservation and Recreation, 2009