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Genus Ludwigia Family Onagraceae

Description: Shrubs or herbs, erect or spreading and rooting at the nodes, often aquatic with submerged parts bearing pneumatophores.

Leaves alternate or opposite, rarely whorled, usually entire.

Flowers usually solitary, occasionally clustered, in upper leaf axils or in an inflorescence, often with bracteoles; actinomorphic. Hypanthium not extended beyond the ovary. Sepals 4 or 5, persistent. Petals 4, 5 or 0, yellow or white.

Fruit an irregularly dehiscent capsule, loculi equal in number to sepals; seeds free or embedded in the endocarp.


Photo © ANBG

Distribution and occurrence: World: 75 spp., Amer. & Old World. Aust.: 7 spp. (4 spp. native, 3 spp. naturalized, 1 sp. of doubtful status), all mainland States.

Text by J. M. Dalby
Taxon concept:

 Key to the species 
1 Leaves alternate; stamens 8 or 102
Leaves opposite; stamens 45
2Plants erect3
Plants prostrate
                       Back to 1
Ludwigia peploides
3Fruit prominently 4- or sometimes 5-angled4
Fruit ribbed, but ± terete
                       Back to 2
Ludwigia octovalvis
4Plant hairy; leaves up to 12 cm longLudwigia peruviana
Plant glabrous; leaves usually >12 cm long
                       Back to 3
Ludwigia longifolia
5Petals present; fruit 5–7 mm longLudwigia repens
Petals absent; fruit 2–5 mm long
                       Back to 1
Ludwigia palustris

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