Ludwigia L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 308

4. Ludwigia L. 1

( Isnardia L. , Jussiaea L. )

Perennial herbs of wet places. Leaves opposite or alternate. Flowers actinomorphic, axillary; hypanthial tube absent. Sepals 4 or 5, somewhat persistent in fruit; petals 0 or 5, yellow, showy; stamens 4, or 10 in 2 whorls; stigma entire; ovary 4- or 5-locular. Fruit an irregularly dehiscent capsule; seeds numerous, small, free or embedded in coherent woody blocks of endocarp. Literature: P. H. Raven, Reinwardtia 6: 327-427 (1963). 1 Leaves opposite; petals absent; stamens 4 3. palustris 1 Leaves alternate; petals present; stamens 10

2 Flowering stems coarsely and densely hairy 1. uruguayensis 2 Flowering stems finely hairy to subglabrous 2. peploides