Brasenia

Junsai-asaproductinastore-march16-2014

Junsai held above Soup

Ponds along Attikamek Trail at Sault Ste. Marie Canal NHS

Brasenia is a genus of aquatic plants, belonging to the family Cabombaceae. It is a small genus, with its most well-known species being Brasenia schreberi, commonly referred to as the water shield. This plant is characterized by its floating, oval-shaped leaves that are purplish underneath and have a distinctive gelatinous coating. This coating is thought to serve as a defense mechanism against predators and pathogens. Brasenia schreberi is found in slow-moving or still freshwater bodies such as ponds, lakes, and slow streams across various parts of the world, including North America, Asia, and Australia.

Description

Brasenia species are perennial aquatic plants. They have submerged stems and rhizomes that anchor them to the muddy bottoms of water bodies. The leaves of Brasenia are notable for their floating nature, emerging on long petioles from the water surface. These leaves are green on the top surface, while the underside is typically a reddish-purple color. The gelatinous substance that covers the leaves and stems is a hallmark of the genus, providing a slippery texture.

The flowers of Brasenia are small, reddish-purple, and bloom above the water surface. They are wind or insect-pollinated, with each flower having multiple stamens and pistils. The fruit of Brasenia is a small, greenish capsule containing several seeds, which are dispersed by water currents or animals.

Ecology

Brasenia plays a significant role in its ecosystem, providing habitat and food for various aquatic organisms. The dense mats formed by the leaves can offer shelter to fish and invertebrates, while the seeds and young shoots may serve as food for waterfowl and other animals. The plant's ability to grow in a range of freshwater habitats, from acidic bogs to alkaline lakes, makes it an important species for maintaining biodiversity in aquatic environments.

Cultivation and Uses

While not widely cultivated, Brasenia is sometimes grown in water gardens and ponds for its ornamental value. Its unique appearance and the protective gelatinous coating make it an interesting addition to aquatic settings. In some parts of the world, Brasenia schreberi is harvested for food. The young shoots and leaves are edible and are used in salads, soups, and pickles in various Asian cuisines. The plant is also known for its medicinal properties, with traditional uses including the treatment of gastrointestinal disorders and skin conditions.

Conservation

The conservation status of Brasenia varies by region, but it is not currently listed as a globally threatened species. However, habitat destruction, water pollution, and the introduction of invasive species pose potential threats to its populations. Conservation efforts are focused on preserving natural water bodies and promoting sustainable practices to ensure the survival of Brasenia and other aquatic plants.