small carpetgrass, joint-head grass
Arthraxon hispidus (Thunb.) Makino


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, 0.2 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.
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.


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EDDMapS Distribution

EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit

State Regulated List

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Liliopsida
Subclass: Commelinidae
Order: Cyperales
Family: Poaceae
Genus: Arthraxon
Subject: Arthraxon hispidus (Thunb.) Makino

Synonyms and Other Names

Other Common Names:
jointhead arthraxon, hairy jointgrass

Related Scientific Names:
Arthraxon ciliaris cryptatherus (Thunb.) Makino (Synonym)
Arthraxon hispidus cryptatherus (Thunb.) Makino (Synonym)
Phalaris hispida (Thunb.) Makino (Synonym)


Plants - Grass or Grasslike