New zealand pigmyweed (Crassula helmsii)
Description
Crassula helmsii, known as swamp stonecrop or New Zealand pigmyweed, is an aquatic or semiterrestrial species of succulent plant in the family Crassulaceae. Originally found in Australia and New Zealand, it has been introduced around the world. In the United Kingdom, this plant is one of five introduced aquatic plants which were banned from sale from April 2014. This is the first ban of its kind in the country. The shoots are rather stiff, carrying narrow parallel-sided leaves in opposite pairs, each leaf being about 4-24 millimetres (0.16-0.94 in). Small white flowers with four petals are produced in summer on long stalks arising from the upper leaf axils. The flowers are always above water.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Magnoliopsida
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Order: Saxifragales
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Family: Crassulaceae
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Genus: Crassula
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