Lythrum tribracteatum is a species of flowering plant in the loosestrife family known by the common name threebract loosestrife.

Lythrum tribracteatum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Lythraceae
Genus: Lythrum
Species:
L. tribracteatum
Binomial name
Lythrum tribracteatum

It is native to Europe, and it is found in parts of western North America as an introduced species. It often grows in moist habitat, such as ponds. This is an erect, branching annual herb growing up to about 30 centimeters in maximum height. The oblong leaves are up to 2.5 centimeters long and arranged oppositely on the lower stem, and alternately on the upper. Clusters of small flowers grow in the leaf axils, each with glandular bright red sepals and tiny lavender petals.

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