Invasive Alien Species

Species Name: Ludwigia perennis

Family Name:
Ludwigia  gracilis Miq.
L. leucorhiza Blume
L. lythroides Blume
L. parviflora Roxb.
Widely branched erect annual herb, 10-75 cm tall. Stem angular, often strongly purplish, the base often with a layer of aerenchyma. Leaves scattered, narrowly elliptic to lanceolate, underneath sparingly hairy, 1.5-12.5 x 0.2-3 cm; petiole winged, 4-20 mm.  Inflorescence solitary flower or in short leavy racemes; sepals 4 rarely 5, deltoid; calyx tube sub-cylindrical, ribbed, 4-9 mm long, conspicuously red-tinged; petal 4, bright yellow, elliptic; stamen usually 4 or 5; style 0.7-1.5 mm, stigma globose. Fruit capsule thin-walledl sub-cylindrical, 4-angled; seeds ellipsoid, initially red, ultimately brown.
Invaded Habitat:
Fallow rice fields, dikes, along ditches, lowlands-irrigated and rain-fed rice fields, river and water courses, dry riverbeds, sugarcane fields
In Indonesia as far as known in Sumatra, Java and Sulawesi
Sunny, humid or marshy situations, from lowland to 500 m altitude
  1. Backer , C. A. & R. C. Bakhuizen Van Den Brink.  1963.  Flora of Java. Vol. I. N.V. P. Noordhoff. Groningen, Netherlands.
  2. Soerjani, M.,  A. J. G. H. Kostermans & Gembong Tjitrosoepomo (Eds.).         1987.  Weeds of Rice in Indonesia. Balai Pustaka. Jakarta.