- Hygrophila polysperma may be annual or perennial depending on location. The four angled stems grow from 4-8 in. (10-20 cm) tall and are often prostrate. Stems are slightly swollen above the nodes. It is native to temperate and tropical Asia, which includes China and India. It is cultivated in some areas.
- The petiolate leaves are ovate to lanceolate with a smooth margin.
- Hygrophila polysperma has tiny white flowers that bloom on terminal spikes from September to November.
- The fruits are oblong capsules with trichomes along the edge. Each fruit produces from 20-30 seeds. Fruits mature from October to January.
- Ecological Threat
- Hygrophila polysperma can become an invasive problem in some tropical and temperate regions outside of its native range. It is listed as a noxious weed in the United States. Hygrophila polysperma has only been reported in Alabama, Florida, Kentucky, South Carolina, Texas and Virginia. It has also been reported in Northern Mexico.
- Federal Noxious Weed Disseminules of the U.S. - USDA-APHIS
- Identification and Biology of Non-Native Plants in Florida's Natural Areas - University of Florida
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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 www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Invasive Listing Sources
- Alachua County Cogongrass Initiative
- California Noxious Weeds
- Faith Campbell, 1998
- Federal Noxious Weeds
- Florida Exotic Pest Plant Council - Category I
- Massachusetts Noxious Weeds
- New Hampshire Prohibited Aquatic Species
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- North Carolina Noxious Weeds - Class A
- South Carolina Noxious Weeds
- Treasure Coast Cooperative Invasive Species Mgmt. Area - EARLY DRAFT
- USDA APHIS Regulated Pest List
- Vermont Noxious Weeds
- WeedUS - Database of Plants Invading Natural Areas in the United States
Other System LinksPlants: HYPO3
NPDN Pest: PABADBB
NPDN Host: 36917
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|