New Zealand Pigmyweed
New Zealand Pigmyweed near the edge
of a small lake in Dorset
Stems, leaves and flowers
Closer view of flowers, leaves and stems
Close-up of the 4-merous flower
Close-up of fleshy leaves
Australian Swamp Stonecrop
June to August
It is found throughout the country but is less common in the North.
For a map see the National Biodiversity Network Gateway
It is a neophyte, which was introduced to the UK in the 1920s and
first seen in the wild in the Southeast in the1950s.
Since then, it has spread throughout the country.
It has entered the wild as an aquarium throw-out or deliberately
It grows submerged in fresh water, such as ponds, lakes, canals
It also grows in ditches and muddy zones next to fresh water.
It spreads rapidly and covers and chokes water bodies.
It is considered to be an undesirable, invasive alien. Click on the
following link for the NNSS – Non Native Species Secretariat
report for New Zealand Pigmyweed.
New Zealand Pigmyweed is a perennial herb which grows
submerged in water up to 3m deep and on soft mud.
The flowers are small - up to only 2mm. They have 4 white petals,
which are longer than the 4 sepals.
There are 4 stamens and 4 carpels.
Leaves are fleshy, linear to lanceolate and up to 2cm.
The stems are up to 30cm and can both trail in and arise, erect
On mud, the stems are flat against the surface with their ends
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