Botanical name: Ludwigia peruviana Family: Onagraceae (Evening primrose family)
Synonyms: Ludwigia hirta, Ludwigia peruviana var. glaberrima
Peruvian Water Primrose is a subshrub with branchlets hairy, and leaves 8-12 x 3-4 cm, oblong-lanceshaped, tip pointed, base narrowed, hairy; leaf-stalk to 1.5 cm. Flowers are yellow, about 5 cm across; bracteoles up to 1 cm, deciduous; flower-stalk up to 2 cm; calyx tube about 2 cm, hairy, 4-lobed, 1 x 0.5 cm, lanceshaped. Petals are 4, up to 3 x 2 cm, nearly round, yellow; stamens 8; ovary 4-celled, ovules numerous. Capsules are about 3 cm, oblong, slightly 4-angled. Peruvian Water Primrose is found along the stream banks and fresh water ponds from plains up to 300 m. It is native of new world tropics, now naturalized throughout the tropics.
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The flower labeled Peruvian Water Primrose is ...