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

Onagraceae

Ludwigia

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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
 ⇒ Ludwigia arcuata
  2
Petals 4-5 mm long; pedicels of capsules 5-16 mm long, shorter than to equaling the leaves
 ⇒ Ludwigia brevipes
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
 ⇒ Ludwigia spathulata
  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
 ⇒ Ludwigia palustris
    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
 ⇒ Ludwigia repens