monochoria USDA PLANTS Symbol: MOVA
U.S. Nativity: Exotic
Habit: Forbs/Herbs Aquatic Plants
Monochoria vaginalis (Burm. f.) K. Presl ex Kunth

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Taxonomic Rank: Liliopsida: Liliales: Pontederiaceae
Synonym(s): heartshape false pickerelweed, heartshape falsepickerelweed, pickerel weed

Appearance
Monochoria vaginalis is an aquatic herbaceous plant native to temperate and tropical Asia. Plant size, leaf shape, and flower number in M. vaginalis are highly dependent on the amount of water available. It can be annual or perennial. It has a short rhizome. M. vaginalis can grow from 4-20 in. (10-50 cm) tall and is stemless.
Foliage
Two types of leaves are seen. The sessile leaves are up to 2 in. (5 cm) long. The blade is linear with an acuminate apex. Petiolate leaves are cordate with a soft hollow petiole from 3-11 in. (7-28 cm) long.
Flowers
The flowers of M. vaginalis are few to numerous in racemes 0.79-1.6 in. (2-4 cm) long. In California racemes usually bear 2-8 flowers. The peduncles emerge from the sheath of the upper-most leaf.
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 vaginalis is listed as a Federal Noxious Weed. It has been reported in California and Hawaii. It is often seen as a weed in rice fields.

Identification, Biology, Control and Management Resources

Selected Images from Invasive.orgView All Images at Invasive.org


Seed(s); Four seeds aligned with chalaza at top and hilar region at bottom. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Fruit(s); Fruits. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Seed(s); Seeds ca. 1 mm long, ca. 0.6 mm wide
USDA APHIS PPQ , USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

Seed(s); Close-up of the surface of the seeds. FNW taxon.
Julia Scher, USDA APHIS PPQ, Bugwood.org
Additional Resolutions & Image Usage

EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
 


State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.


Invasive Listing Sources: