Ludwigia hyssopifolia (G.Don) Exell
Exell, A.W. (1957) Garcia de Orta 5 : 471.
Occasionally grows into a shrub 2-3 m tall but usually flowers and fruits as a herb.
Cotyledons +/- orbicular or broadly ovate, about 2-6 x 2-6 mm, petioles about 4.5 mm long. First pair of leaves opposite or subopposite, obovate, petioles long and slender. At the tenth leaf stage: leaf blade elliptic, apex acute, base attenuate, petiole narrowly winged. Stem narrowly winged with pairs of wings running down the stem from each petiole. Stipules small and inconspicuous, about 0.25 mm long. Seed germination time 17 to 108 days.