Spreading annual herb with upright stems, rooting at the nodes or floating on water. Leaves narrowly lanceolate, to about 1 cm long,1-3 mm wide, often brown. Flowers solitary and terminal but appearing axillary, 4-parted. Corolla white.
Grows in and around permanently wet areas and naturalised in WA, SA, NSW and widely in Vic.
This species is perhaps better included in the genus Tillaea. Tillaea differs from Crassula in several ways: it consists primarily of tiny and often (semi-) aquatic species; its follicles open in a different way; it has a small number of ovules; and its chloroplast DNA is also different (Hart &Eggli, 1995).
This species is also cultivated in Britain, where it has become widely naturalised and is a serious environmental weed.
WA, SA, NSW, Vic, Tas, NZ.
Source: (2002). Crassulaceae. In: . Horticultural Flora of South-eastern Australia. Volume 3. Flowering plants. Dicotyledons. Part 2. The identification of garden and cultivated plants. University of New South Wales Press.