Erect perennial 4–10 dm from a cluster of fleshy-fibrous roots; stem spreading-hirsute; lvs alternate, erect or ascending, lanceolate or lance-linear, obtuse or acutish, 2–5 cm, rounded at the sessile base, densely pubescent on both sides; pedicels 3–8 mm, bracteolate near the top; fls 4-merous; pet 10–15 mm, exceeding the erect to spreading sep; fr spreading-hirsute, equaling or shorter than the pedicel, otherwise as in no. 5 [Ludwigia alternifolia L.] Swamps on the coastal plain; s. N.J. to Fla., Ark., and Tex. June–Sept.
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