NEW-ZEALAND PIGMYWEED

AUSTRALIAN SWAMP STONECROP

Crassula helmsii

Stonecrop Family [Crassulaceae]  

month8jun month8june month8jul month8july month8Aug month8sep month8sept

status
statusZalien
flower
flower8white
morph
morph8actino
petals
petalsZ4
stem
stem8round

23rd June 2008, Teal Scrape, Pennington Flash, Wigan. Photo: © Paul Breslin
An aggressive alien invader of still freshwaters, usually throw-outs from garden ponds.


14th June 2006, Manchester Airport Pond. Photo: © Paul Breslin
It is a mostly submerged perennial, occupying shallow waters and stranded on mud.


26th Oct 2007 Photo: © Paul Breslin
Forms a thick carpet with reddish stems up to 30cm long and short green leaves.


26th Oct 2007 Photo: © Paul Breslin
The flowers are tiny, just 1-2mm across.


14th June 2006, Manchester Airport Pond. Photo: © Paul Breslin
Flowers have four almost equilateral-triangular petals.


14th June 2006, Manchester Airport Pond. Photo: © Paul Breslin


26th Oct 2011, Fernilee Resevoir, Whaley Bridge, Derbys. Photo: © RWD
Un-opened flower buds are pinkish. The fruits are in four segments and greenish at first.


26th Oct 2011, Fernilee Resevoir, Whaley Bridge, Derbys. Photo: © RWD
The flowers have four white petals and four stamens bearing yellow pollen.


26th Oct 2011, Fernilee Resevoir, Whaley Bridge, Derbys. Photo: © RWD
In autumn the leaves go brownish.


26th Oct 2011, Fernilee Resevoir, Whaley Bridge, Derbys. Photo: © RWD
Leaves short and fleshy, mostly in opposite pairs up a fleshy reddish stalk.


Distinguishing Feature : Easily distinguished from Pygmyweed which is tiny and grows only on the shores of Loch Shiel, Scotland, whereas New Zealand Pigmyweed is found in many places south of the Forest of Bowland.

This is another problematic plant in that it quickly invades any still freshwater where it has been discarded by aquatic gardeners, to the detriment and ultimately entire exclusion of all other aquatic plants and fish in the pond.

An aquatic plant that is usually submerged, but sometimes becomes stranded on muddy shores. It was virtually un-known in Britain two decades ago.


  Crassula helmsii  ⇐ Global Aspect ⇒ Crassulaceae  

Distribution
family8Stonecrop family8Crassulaceae

 BSBI maps
genus8Crassula
Crassula
(Pigmyweeds)

NEW-ZEALAND PIGMYWEED

AUSTRALIAN SWAMP STONECROP

Crassula helmsii

Stonecrop Family [Crassulaceae]  

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