Open the Advanced Search

Welsh Mudwort

Limosella australis

Please keep in mind that it is illegal to uproot a plant without the landowner's consent and care should be taken at all times not to damage wild plants. Wild plants should never be picked for pleasure and some plants are protected by law.
For more information please download the BSBI Code of Conduct PDF document.


Plant Profile

Flowering Months:
Scrophulariaceae (Figwort)
Life Cycle:
Maximum Size:
15 centimetres tall
Marshes, meadows, mud, mudflats, riverbanks, saltmarshes, seaside, waterside, wetland.

White, 5 petals
The solitary flowers are white with an orange petal-tube. Similar in appearance to Water Mudwort (Limosella aquatica) but the flowers are always white rather than sometimes pink. Also, the petal-tube is longer than the blunt sepal teeth. The style is also longer and flowers do not close in dull weather. The flowers each measure about 3mm across.
Almost globular fruit capsules on arching stems.
A matted annual or perennial with narrow, linear leaves. Grows in estuarine mud.
Flowers are scented.
Other Names:
Atlantic Mudwort, Austral Mudwort, Southern Mudwort.
Frequency (UK):
Rarely seen  

Similar Species

Other Information


Limosella australis, also known as southern mudwort, is a small perennial herb that is native to wetland habitats in the southern United States, Mexico, and Central America. It is a member of the Plantaginaceae family and has small, white, 5-petaled flowers that bloom in the spring and summer. The leaves are narrow and linear, and the plant typically grows to be about 2-6 inches tall. Limosella australis prefers wet, muddy soils and can be found in wet meadows, marshes, and along stream banks. It is not considered to be a threatened species and is not protected by any laws.


Welsh Mudwort, scientifically known as Limosella australis, is a rare aquatic plant species found in the wetlands of Wales, the United Kingdom. This tiny herbaceous plant belongs to the family Scrophulariaceae, commonly known as the Figwort family.

The Welsh Mudwort is a unique and fascinating plant that has adapted to its wetland habitat. It has a prostrate growth habit and produces tiny leaves that form a rosette on the ground. The leaves are typically about 2-4mm long, linear, and pointed at the tip. The stem of the plant is very short, and the flowers grow directly from the rosette.

The flowers of the Welsh Mudwort are also very small, usually measuring about 3-4mm in diameter. They have a five-lobed, pale pink to white corolla with a yellow center. The flowers bloom from May to August and are pollinated by insects such as bees and flies.

The Welsh Mudwort is a critically endangered species, and its habitat is under threat due to human activities such as drainage and land reclamation. It is also affected by the invasion of non-native plant species, which compete with the Welsh Mudwort for resources.

Conservation efforts are in place to protect the Welsh Mudwort and its habitat. In Wales, the plant is protected under Schedule 8 of the Wildlife and Countryside Act 1981. The Welsh Mudwort is also listed as a priority species under the UK Biodiversity Action Plan.

In addition to its ecological importance, the Welsh Mudwort has been used in traditional medicine to treat various ailments such as kidney stones, inflammation, and fever. The plant contains several bioactive compounds such as flavonoids, alkaloids, and tannins that have potential medicinal properties.

The Welsh Mudwort has also been studied for its potential use in bioremediation, a process of using living organisms to remove pollutants from the environment. It has been found that the plant has the ability to absorb heavy metals from contaminated water, making it a potential candidate for phytoremediation.

The plant is also known for its ability to survive in harsh environmental conditions, such as waterlogged soils with low nutrient availability. This makes it an important species for ecological restoration projects, where it can help to stabilize and restore wetland habitats.

Despite its small size and inconspicuous appearance, the Welsh Mudwort plays an important role in the wetland ecosystem. It provides food and shelter for insects and other small animals, and helps to maintain the overall health and biodiversity of the wetland.

Interestingly, the Welsh Mudwort is not only found in Wales, but also in other parts of Europe, Asia, and North America. However, the Welsh population is considered to be the most genetically diverse, and therefore the most important for the conservation of the species.

The plant's common name, Mudwort, reflects its ability to grow in muddy or waterlogged soil. This adaptation allows the plant to survive in areas where other plant species cannot.

Despite its critical endangered status, the Welsh Mudwort is not a well-known plant species outside of Wales. Raising awareness about this unique and important plant can help to generate interest and support for conservation efforts.

The Welsh Mudwort is a remarkable and valuable plant species that plays an important ecological and medicinal role. Its adaptability to harsh environmental conditions, potential use in bioremediation and ecological restoration, and critical endangered status make it a fascinating and important plant species to study and conserve.

The Welsh Mudwort has been the focus of research for many years, and there is still much to learn about this fascinating plant. Scientists have studied the plant's genetics, ecology, and physiology to better understand its unique adaptations and potential uses.

One recent study found that the Welsh Mudwort may be able to tolerate climate change better than other wetland plant species. The researchers discovered that the plant's ability to regulate water uptake and transport may help it to survive in drier and warmer conditions.

Conservation efforts for the Welsh Mudwort include habitat protection, restoration, and monitoring. Efforts are also underway to propagate the plant in nurseries, with the aim of reintroducing it to suitable habitats.

In addition to its ecological and medicinal importance, the Welsh Mudwort also has cultural significance. It has been used in Welsh folklore to ward off evil spirits and protect against lightning strikes. The plant's pink flowers are said to resemble tiny bells, and were traditionally used to call forth the fairies.

In conclusion, the Welsh Mudwort is a fascinating and important plant species with a rich ecological, medicinal, and cultural history. Its unique adaptations, potential uses, and critical endangered status make it a valuable subject for research and conservation efforts. By protecting and conserving the Welsh Mudwort and its habitat, we can help to ensure the continued health and biodiversity of our wetland ecosystems.

Distribution Map

Reproduced by kind permission of the BSBI.

Click to open an Interactive Map