Monochoria vaginalis

Species category

Weed

Common name

heartshape false pickerelweed

Diagnostic characters

Planting unit

True seedTrue seed:
A mature fertilized ovule consisting of an embryo, with or without and external food reserve (e.g., endosperm) enclosed by the testa.

Shape

OvalOval:
Broadly elliptic.

Size

Length 0.8–0.9 mm
Width 0.4–0.6 mm
Thickness 0.4–0.6 mm

Color

Light brown

Texture

Ribs are longitudinal and widely spaced with transverseTransverse:
Set crosswise, crossing or at right angles.
stipples between ribs.

Other structures

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
is a point at base.

Identification notes

Ribs join at dark circle at seed apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
.

Noxious weed seed categories

Federal

Learn more on ITP's Federal Noxious Weed Disseminules tool, listed under Monochoria vaginalis.

AOSA examination list

Not included

Nomenclature

Family

Pontederiaceae

Valid name

Monochoria vaginalis (Burm. f.) C. Presl ex Kunth

Synonyms

Monochoria vaginalis (Burm. f.) C. Presl ex Kunth var. pauciflora (Blume) Merr.
Pontederia vaginalis Burm. f.

Monochoria vaginalis. True seeds with longitudinal and wide-spaced ribs with transverse stipples between ribs. Photo by Julia Scher, USDA-APHIS-PPQ.	Monochoria vaginalis. True seeds with longitudinal and wide-spaced ribs with transverse stipples between ribs. Photo by Julia Scher, USDA-APHIS-PPQ.
Monochoria vaginalis. True seeds with longitudinal and wide-spaced ribs with transverse stipples between ribs. Photo by Julia Scher, USDA-APHIS-PPQ.	Monochoria vaginalis. True seeds with ribs that join at a dark circle at the apex. Photo by Julia Scher, USDA-APHIS-PPQ.
Monochoria vaginalis. True seeds with ribs that join at a dark circle at the apex. Photo by Julia Scher, USDA-APHIS-PPQ.	Monochoria vaginalis. Light brown true seeds. Photo by Julia Scher, USDA-APHIS-PPQ.