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Key to Ludwigia

Onagraceae

Ludwigia

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(c) Powell, Eric M - CC-BY-NC, permission granted to NCBG
(c) Smith, Jake - CC-BY-NC, permission granted to NCBG
1 Leaves opposite; plants creeping (rooting at the nodes); [section Isnardia]
(c) Goldman, Douglas - CC-BY-SA
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]