Alisma consists of herbaceous perennials that grow from rhizomes and thrive in moist environments. They feature rosettes of elongated, elliptic leaves that are borne on long stalks. In spring, the plants produce open clusters of small flowers, which can be white or pink.

Alisma

Alisma canaliculatum

Alisma gramineum

Alisma lanceolatum is a perennial aquatic plant that thrives in shallow water, with its roots anchored below the surface while its leaves and flowers extend above. This species typically reaches a height of 70 cm and spans about 25 cm in width. Its leaves are lance-shaped, measuring between 12 and 40 cm in length and 1 to 3 cm in width, arranged in a rosette at the base. Submerged leaves are generally smaller and exhibit fewer veins. From June through August, it produces clusters of small, three-petalled flowers that are pinkish-purple in hue, arranged in circular formations along branching stems, with blooms opening in the morning.

Alisma lanceolatum

Alisma plantago-aquatica is a perennial plant that thrives in wet, marginal areas. It produces rosettes of grey-green foliage that can reach lengths of up to 30 cm. In late spring, it sends up tall flower stalks adorned with white blooms that measure around 1.5 cm in diameter.