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.
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
| ||Key to the species|| |
|1 ||Leaves alternate; stamens 8 or 10||2|
|Leaves opposite; stamens 4||5|
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|3||Fruit prominently 4- or sometimes 5-angled||4 |
|Fruit ribbed, but ± terete|
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|Ludwigia octovalvis |
|4||Plant hairy; leaves up to 12 cm long||Ludwigia peruviana |
|Plant glabrous; leaves usually >12 cm long|
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|Ludwigia longifolia |
|5||Petals present; fruit 5–7 mm long||Ludwigia repens|
|Petals absent; fruit 2–5 mm long|
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