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swamp stonecrop
Scientific Name: Crassula helmsii
Family: Crassulaceae
Category: Dicot
Growth:
Duration:
Other Names:
Australian Swamp Stonecrop (Crassula helmsii)
Crassula helmsii, commonly known as Australian swamp stonecrop or New Zealand pygmyweed, is a succulent plant that can thrive in both aquatic and semi-terrestrial environments.
Considerations for Pets
- Crassula helmsii is a succulent.
Taxonomy and Nomenclature
- Scientific Name: Crassula helmsii
- Family: Crassulaceae
- Synonyms: Tillaea aquatica, Tillaea recurva
- Common Names: Australian swamp stonecrop, New Zealand pygmyweed, swamp stonecrop, Australian stonecrop, Crassule des tangs (French), Helms Dickblatt
Distribution and Habitat
- Native to Australia (including Tasmania) and New Zealand.
- Found in aquatic and semi-terrestrial habitats.
Ecological Role
- Considered a non-native invasive plant in many regions, including the U.K.
- Known to out-compete native plants, forming dense mats over the water surface.
- Can negatively impact pond life.
Morphological Characteristics
- Herbaceous succulent perennial plant.
- Small creeping plant with narrow succulent leaves.
- Stems are round, 1 mm thick, and 10-130 cm long, either creeping or floating.
Interactions with Other Organisms
- Grazing vertebrates can promote the abundance of invasive swamp stonecrop.
Historical Context
- Introduced from Tasmania to Britain in 1911.
- First sold as an oxygenating pond plant in 1927.
- Banned from sale in some regions after April 2014.
Further Information
- NBN (National Biodiversity Network) location data.
- ResearchGate: CEH Information Sheet 12: Crassula helmsii, Australian Swamp Stonecrop.
- Dave's Garden.
- Invasive.org.