Glossostigma Wight & Arn.
Australia, New Zealand, Asia, Africa
Species commonly cultivated
Glossostigma diandra (L.) Kuntze (Australia, New Zealand, Asia, Africa)
G. elatinoides Benth. (Australia, New Zealand)
Glossostigma diandra is introduced into the northeastern United States.
Not generally considered weedy in its native range. Glossostigma diandrum was the subject of a Pest Alert by USDA-APHIS in the late 1990s due to the east coast invasion. Molecular analyses indicate this species may have actually been G. cleistanthum. Both of these species are declared noxious weeds in the state of Washington (United States).
small, amphibious, stoloniferous plant, forms dense mats
Annual or perennial. Very small. Stems stoloniferous, creeping, rooted at nodes. Leaves opposite or occasionally whorled, sessile or petiolate, linear to spatulate; margin entire. Inflorescence a minute, solitary flower borne on axillary pedicel; sepal tube bell-shaped, lobes 3-4; petals 5, white to pink or purple. Dispersal by stem fragments or seeds.
shallow water and wet ground