caldesia
Caldesia is a genus of aquatic plants. Leaves are all basal, floating or aerial, ovate to elliptical, cordate or subcordate. Flowers are hermaphrodite, in racemes or panicles. Fruitlets are drupaceous, with woody endocarp and spongy exocarp, swollen, with a short subventral beak, smooth or with tubercles or spines. It includes three living species. Caldesia is widespread across Europe, Asia, Africa and Australia.