Gen. Pl. 1: 372. 1789.
Herbs, young vegetative parts heavily coated with mucilage. Leaves floating; petiole long. Leaf-blade elliptic. Flowers: sepals 3, not petaloid, linear-oblong to narrowly ovate; petals 3, linear-oblong, lacking auricles, base not clawed; stamens 18-36 (-51), opposite both sepals and petals; pistils 4-18, simple, 1-locular; ovules (1-) 2; stigma linear-decurrent. Fruits slightly to strongly fusiform. Seeds ovoid, tubercles absent. x = 40.
Worldwide except Europe, mainly temperate and upland tropics
Species 1 (1 in the flora).
Brasenia is known from the fossil record in Europe although it is not known to grow there currently.
"shortened" is not a number.