Ludwigia epilobioides is a 30-70cm-tall
annual that grows in paddy fields or wetlands, with ridges on stems,
often taking red. Leaves are 3-10cm long and 1-2cm wide and
lanceolate-shaped, with conspicuous veins on the surfaces, turning
red in autumn. Axils set petiole-less, small, 6-8mm-in-diameter
flowers; petals are shorter than sepals. The fruit (capsule) is
1.5-3cm in length. Bloom time: August-October.