Hydrolea zeylanica is an annual, ascending or procumbent, sparingly branched, nearly smooth herb, a few cm to 1.2 meters in length, and rooting at the lower nodes. Leaves are lanceolate, 4 to 10 mm long, and pointed at bvoth ends. Flowers are very numerous, bright blue, and borne in racemes. Sepals are hairy, green, oblong-linear, and about 5 mm long. Corolla is 8 to 10 mm in diameter, with ovate lobes. Capsule is ovoid, surrounded by the persistend calyx-lobes, and contains numerous, minute, oblong seeds.
Found in norther Luzon to Mindoro.
Probably in most islands and provinges.
In open wet places, often common in rice paddies as a weed.
Considered to have antiseptic properties.
Leaves, beaten into a pulp, used as poultice to facilitate healing of neglected and callous ulcers.