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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Ludwigia

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1 Leaves opposite; plants creeping (rooting at the nodes); [section Isnardia]
1 Leaves alternate; plants erect or ascending (not rooting at the nodes), or creeping (rooting at the nodes).
..2 Stamens 8-14; sepals 4-7; petals 4-7; [of various habits, including annual and perennial herbs and shrubs, variously erect, ascending, creeping, or forming floating mats]
..2 Stamens 4; sepals 4; petals 0-4; [perennial herbs, with erect ascending flowering stems]
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