- Source: Trithuria australis
Trithuria australis is a species of aquatic plant in the family Hydatellaceae endemic to Western Australia.
Description
= Vegetative characteristics
=Trithuria australis is an annual, submerged aquatic plant. The terete, pointed leaves are 20–25 mm long, and 0.3 mm wide.
= Generative characteristics
=The reproductive units ("flowers") are unisexual. Both female and male reproductive units are present on the same plant. The reproductive units are sessile or exhibit very short peduncles. The male reproductive unit has 3-8 stamens. The seed coat is brown and smooth. It is believed to be self-pollinating.
Cytology
The chromosome count is 2n = 14.
Distribution
It is known from several populations occurring in the Western and Southwestern parts of the state Western Australia.
Taxonomy
Trithuria australis (Diels) D.D.Sokoloff, Remizowa, T.D.Macfarl. & Rudall was first described as Hydatella australis Diels by Friedrich Ludwig Emil Diels in 1904. Later it was included in the genus Trithuria Hook.f. as Trithuria australis (Diels) D.D.Sokoloff, Remizowa, T.D.Macfarl. & Rudall by Dmitry Dmitrievich Sokoloff, Margarita Vasilyena Remizowa, Terry Desmond Macfarlane & Paula J. Rudall in 2008. The type specimen was collected by L. Diels in Hamersley River, Western Australia in October 1901. It is included in Trithuria sect. Hydatella (Diels) D.D. Sokoloff, Iles, Rudall &
S.W. Graham, of which it is the type species.
Etymology
The specific epithet australis means southern.
Ecology
= Habitat
=It grows in swamps. It occurs sympatrically with Centrolepis.