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.

In marshes, swamps and wet meadows, New Hampshire to Ontario, Michigan and Kansas, south to Florida and Texas. Flowering from the latter part of June to September.

Plate 145

B. Seedrox; Rattlebox   Ludwigia alternifolia

B. Seedrox; Rattlebox - Ludwigia alternifolia