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Rubiaceae family

Oldenlandia corymbosa Linnaeus, Sp. Pl. 1: 119.  1753.
Syn.: Hedyotis corymbosa (Linnaeus) Lamarck (1792).

Naturalized quite common herb of open bare areas at lower elevations.
Native to tropical Africa, India.
See also the very rare Oldenlandia lancifolia