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small carpetgrass, joint-head grass

Arthraxon hispidus (Thunb.) Makino

USDA PLANTS Symbol: ARHI3
U.S. Nativity: Exotic
Habit: Herb


Synonym(s): jointhead arthraxon, hairy jointgrass

Appearance
The plant stands to 1.5 ft. (0.5 m) tall with oval to lance-shaped leaves.
Foliage
Leaves are 1-3 in. (2.5-7.6 cm) long, 0.2 in. (0.5 cm) wide and have heart shaped bases. The margins of the leaves have conspicuous hairs.
Flowers
Flowers bloom in early fall and are contained in 1 to several, 1-3 in. (2.5-7.6 cm) long spikes.
Fruit
Fruit is a caryopsis.
Ecological Threat
Arthraxon hispidus is an annual grass that was introduced into the United States, either accidentally or by immigrants, from Japan and eastern Asia. Arthraxon hispidus inhabits wet areas such as stream banks, flood plains and shorelines.


Identification, Biology, Control and Management Resources

Invasive Plant Atlas of New England - University of Connecticut
Weed of the Week - USDA Forest Service
Plant Invaders of Mid-Atlantic Natural Areas - National Park Service