A genus which is regarded by some authors as being monospecific

Source: [
• 4
]. 

Carpels 10–30, free, ovoid; style ventral; ovules solitary, basal; abortive carpels in the ♂ flowers 0

Source: [
• 4
]. 

However, the differences between the two species described here are constant, and too diverse to be variations of the same species

Source: [
• 4
]. 

Achenes crowded on the small receptacle, swollen, with lateral air-chambers, ridged

Source: [
• 4
]. 

A third species, L. fluitans Graebn., with linear-lanceolate leaves and small (3 × 2 mm.) achenes which are sharply ridged and shiny when dried, has been found in the French Cameroons and S. Nigeria

Source: [
• 4
]. 

Petals 3, larger than the sepals, white

Source: [
• 4
]. 

Stamens 6; filaments broadened at the base

Source: [
• 4
]. 

Peduncle longer than the leaves; inflorescence of 4–7 whorls of flowers, the lowest sometimes with 2–3 branches; upper whorls of ♂ flowers, lower of hermaphrodite and ♂ flowers; bracts 3, membranous, glabrous or pubescent; bracteoles 3 or more, glabrous or pubescent, smaller than the bracts

Source: [
• 4
]. 

Sepals 3, spreading

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• 4
]. 

Leaves erect; leaf-blade with obtuse to rounded apex; base sagittate or cuneate; blade and petiole glabrous, scabrid or pubescent

Source: [
• 4
]. 

This appears to be very rare, and has not so far been discovered in our area.

Source: [
• 4
]. 

Perennial aquatic and marsh herbs

Source: [
• 4
].