Ludwigia perennis L.
Family: Onagraceae
Taxonomy: Plantae > Tracheophyta > Magnoliopsida > Myrtales > Onagraceae > Ludwigia > L. perennis
Common name [English]: Perennial Water Primrose
Vernacular name [Malayalam]: നീർകരായമ്പു
Nativity: Tropical & Subtropical Old World
Habitat: Waterlogged areas in grasslands, ponds, ditches, puddles, marshes, swamps.
Description: Erect herbs. Leaves 2-6 x 0.5-15 cm, elliptic-lanceolate, base attenuate, apex acute to acuminate, glabrous. Flowers sessile, 4-merous. Calyx tube adnate to ovary; lobes 4, c. 2 mm long, ovate acuminate. Petals 4-5 mm long, elliptic, yellow. Stamens 4; filaments short. Ovary 1-1.5 cm long, linear, 4-celled, 4-angled. Ovules many. Capsule 1-2 cm long, linear, subterete, 4-ribbed. Seeds ellipsoid.
Flowering and Fruiting :Throughout the year
Uses: Folk medicine
Cultivation : Wild
References
http://www.plantsoftheworldonline.org
https://indiabiodiversity.org