BugwoodWiki Article

miramar weed
Hygrophila polysperma (Roxb.) T. Anders.

Overview

Appearance
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.
Foliage
The petiolate leaves are ovate to lanceolate with a smooth margin.
Flowers
Hygrophila polysperma has tiny white flowers that bloom on terminal spikes from September to November.
Fruit
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.

Selected Images


1148115
1148115

miramar weed
Hygrophila polysperma
Infestation
USDA APHIS PPQ Archive
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1148117

miramar weed
Hygrophila polysperma
Infestation
USDA APHIS PPQ Archive
1148118
1148118

miramar weed
Hygrophila polysperma
Plant(s)
USDA APHIS PPQ Archive
5376481
5376481

miramar weed
Hygrophila polysperma
Fruit(s)
Julia Scher
0015015
0015015

miramar weed
Hygrophila polysperma
Seed(s)
USDA APHIS PPQ Archive
5376482
5376482

miramar weed
Hygrophila polysperma
Seed(s)
Julia Scher
5376483
5376483

miramar weed
Hygrophila polysperma
Seed(s)
Julia Scher

Maps


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

EDDMapS Distribution

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

State Regulated List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Scrophulariales
Family: Acanthaceae
Genus: Hygrophila

Other System Links

Plants: HYPO3
Bayer: HYGPO
GRIN: 316380
ITIS: 182342
NPDN Pest: PABADBB
NPDN Host: 36917

Synonyms and Other Names

Other Common Names:
East Indian hygrophila, Indian swampweed

Categories

Category: Forbs/Herbs
Category: Aquatic