arrowleaved monochoria
(Monochoria hastata)
This species is a Cultivar and may be non-native across its range in the United States
Appearance
Monochoria hastata is a perennial aquatic herbaceous plant native to temperate and tropical Asia and Northern Australia. Plant size, leaf shape, and flower number in M. hastata are highly dependent on the amount of water available. It has a well-developed, branching rhizome and plants may be connected by stolons. M. hastata can grow from 12-40 in. (30-100 cm) tall.
Foliage
Leaves of mature M. hastata have a hastate base and an acuminate tip. They have long sheath-like petioles.
Flowers
The blue to purple flowers of M. hastata are held on spike-like racemes. There can be from 15-60 flowers per raceme.
Fruit
Fruits are ellipsoid 3-valved capsules about 0.4 in. (1 cm) long. The numerous oblong seeds have 8-12 longitudinal ribs.
Ecological Threat
Monochoria hastata is listed as a Federal Noxious Weed. It grows in rice fields and other shallow bodies of water.
Selected Images
Maps
State Lists - This map identifies those states that have this species on their invasive species list or law.
Invasive Listing Sources
- Federal Noxious Weeds
- Florida Noxious Weeds
- Indiana Invasive Species Council - Invasive Plant List
- Indiana Pest Species
- Indiana Prohibited Plant Species
- Massachusetts Noxious Weeds
- Massachusetts Prohibited Plant List
- South Carolina Illegal Aquatic Plants
- South Carolina Plant Pest List
- Texas Noxious Weeds
- USDA APHIS Regulated Pest List
Taxonomic Rank
| Domain: Eukarya |
| Kingdom: Plantae |
| Phylum: Magnoliophyta |
| Class: Magnoliopsida |
| Superorder: Lilianae |
| Order: Commelinales |
| Family: Pontederiaceae |
| Genus: Monochoria |
| Monochoria hastata |
References
Common Name Reference: Weed Science Society of America Common Names List
Scientific Name Reference: USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.