L., Sp. Pl. 118 (1753).
Derivation: Named in honour of C. G. Ludwig, 1709-1773, Professor of medicine in Leipzig.
Synonymy: Jussiaea L., Sp. Pl. 388 (1753).
Common name: None
Perennial herbs with branches forming extensive mats on marshy soils or floating in shallow water; leaves alternate, petiolate, entire.
Inflorescence raceme-like, with flowers in the axils of leaf-like bracts but with 2 deciduous bracteoles at the apex of the pedicel; floral tube 0.2-0.3 cm long, densely hairy inside, eventually deciduous; sepals 5, free; petals 5, broadly ovate, truncate to emarginate, yellow; stamens 10 in 2 whorls of about equal length, with the anthers usually basifixed, c. 2 mm long; ovary inferior, with 5 cells each with many ovules on an axile placenta; style hairy, as long as or longer than the stamens and with a capitate terminal stigma.
Fruit indehiscent and eventually disintegrating from the apex; seeds obovoid to ellipsoid, smooth, without hairs.
A cosmopolitan genus of about 75 species, which is particularly well represented in tropical America.
Not yet available