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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, Key A: Ludwigia with opposite leaves (section Isnardia)

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1 Pedicels of flowers and fruits 5-35 mm long.
..2 Petals 7-11 mm long; pedicels of capsules 15-35 mm long, longer than the leaves
..2 Petals 4-5 mm long; pedicels of capsules 5-16 mm long, shorter than to equaling the leaves
1 Pedicels of flowers and fruits 0-3 mm long.
....3 Stems, leaves, capsules, and calyx densely hirsute; seeds dark reddish-brown, 0.3-0.4 mm long
....3 Stems, leaves, capsules, and calyx glabrous to sparsely puberulent; seeds tan, 0.4-0.8 mm long.
......4 Petals 0; floral tubes and capsules with 4 longitudinal dark green bands; bractlets (borne at or near the base of the floral tube) absent or 0-1 mm long
......4 Petals 4; floral tubes and capsules lacking green banding; bractlets (borne at or near the base of the floral tube) present, 2-4 mm long
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