Stems erect or nearly erect, branching, 11/2 to 3 feet high, from a perennial root which often bears small tubers; the stems smooth or minutely pubescent and more or less angled. Leaves alternate, lanceolate or linear-lanceolate, pointed at both ends, on very short petioles, 1 1/2 to 4 inches long. Flowers solitary in the axils of the leaves, each flower one-half to two-thirds of an inch broad, on short stalks; the calyx tube short, rounded at the base with four ovate, long-pointed lobes about as long as the four yellow petals which fall away very easily when the plant is disturbed. Fruiting capsule smooth and slightly wing-angled, about one-fourth of an inch high, opening by an apical pore but finally also dehiscent; many seeded.
B. Seedrox; Rattlebox - Ludwigia alternifolia