Some folks refer to the Ludwigia genus as “Seedbox” rather than “Primrose-willow” because of the boxy seed capsules most (perhaps all?) species have. However, these seed capsules have different shapes, with, for example, Ludwigia alternifolia having mostly cube-shaped capsules, while this species, Ludwigia decurrens has an elongated seed capsule which, like L. alternifolia, is square in cross-section.
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