Glossostigma diandrum (L.) Kuntze


Glossostigma diandrum is a small submerged rooted aquatic plant. It forms mats and grows attached to rocks in seasonal or perennial freshwater streams and shallow waterlogged areas. G. diandrum is native to Asia and Australia.
The leaves are glabrous and narrowly elliptic to oblanceolate. They are from 0.06-0.6 in. (1.5-14 mm) long.
G. diandrum has mostly cleistogamous flowers but some may open leading to insect pollination. It usually flowers after rain.
G. diandrum often spreads vegetatively.
Ecological Threat
G. diandrum grows along freshwater lakes, ponds, streams and rivers attached to rocky substrate. It is widely distributed worldwide and is considered an invasive species in the United States.


State Regulated List

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

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Scrophulariales
Family: Scrophulariaceae
Genus: Glossostigma
Subject: Glossostigma diandrum (L.) Kuntze


Plants - Forbs/Herbs