Crassula helmsii
Swamp stonecrop
Crassula helmsii is an evergreen perennial aquatic plant that is able to grow both submerged (under water) and emersed (above water). Submerged stems are long, thin and branched, whereas emersed stems are shorter, fleshy and less branched. The leaves are arranged opposite, fleshy and linear in shape, about 4-20 mm long and 0.8-2 mm wide. They are smooth and glossy, with a light green to yellow-green colour. The plant produces small, white, four-petalled flowers on short stems, mainly from July to September. Crassula helmsii prefers stagnant or slow-flowing freshwater environments and can grow in a wide range of light conditions, from full sun to deep shade. Its ability to grow quickly and reproduce vegetatively has contributed to its spread and invasive potential.
Types of damage
Region of origin
Australia and New Zealand
Introduction vectors
Current distribution
Based on the FlorKart Database of the Federal Agency for Nature Conservation, as of 2013
Miscellaneous
Dispersion forecast
Indicates the proportion of land suitable for habitat under current and future climate conditions (2060-2080) under three emission scenarios (RCP26, RCP45 & RCP85).
Habitat suitability under current climate conditions
These habitat suitability maps show for Crassula helmsii where suitable habitat conditions exist.
The map on the left shows this for current climate conditions. Below this are maps for the time classes 2040-2060 and 2061-2080, in which three different emission scenarios can be selected.
The slider at the top left allows you to adjust the opacity of the map to make orientation easier.
By clicking on the respective quadrant, information on the environmental conditions present in it can be called up.
The methodology is explained here .