Widespread. Asia, Africa, North, South and Central America, Oceania. In Australia, Fiji, PNG.
Invasive, long-lived, much-branching, creeping weed of plantations, orchards, vegetable fields, wet pastures, field borders, roadsides, gardens and wasteland. Mainly problem in open, moist habitats with disturbed soils, and young crops. Withstands temporary flooding.
Soft, smooth, fleshy stems, up to 100 cm long, enclosed by sheath at base. Leaves, 4-6 cm long, alternate along stems, with hairs on margins. Flowers, small clusters in upper leaf forks, three bright blue petals, opening in morning. Seeds, dark-brown. Roots from nodes along stems.
Spread: vegetative propagation; seeds; stem pieces; water; soil; as a medicinal plant and ornamental.
Biosecurity: moderately high risk of introduction; used as an ornamental. Available on internet.