Australian swamp stonecrop, stonecrop, New Zealand pygmy weed
Could be confused with
Australia, New Zealand
Species commonly cultivated
Crassula helmsii (Kirk) Cockayne (Australia, New Zealand)
Crassula helmsii is introduced into the United Kingdom.
a serious environmental weed; displacing native plant species in the United Kingdom
Perennial. Creeping or ascending, forming a loose or sometimes tight mat-like stand, rooting at nodes. Leaves fleshy, opposite, decussate, sessile; leaf blade linear to elliptic, venation indistinct; margin entire. Inflorescence axillary, of solitary pedicellate flowers. Flowers bisexual, actinomorphic; sepals 3-5; petals white, 3-5, or sometimes absent or reduced. Dispersal by stem fragments or seed.
shallow or clear water of streams, rivers, and lakes, particularly in temperate climates
Crassula is a very large genus of 300 species worldwide, with only four species being obligate aquatics. Only C. helmsii is cultivated for aquaria or ponds.