Botanical name: Knoxia sumatrensis    Family: Rubiaceae (Coffee family)
Synonyms: Spermacoce sumatrensis, Knoxia corymbosa, Spermacoce corymbosa

Sumatra Knoxia is an erect perennial herb mostly 40-90 cm tall. Stems are little-branched, velvety. Leaves are narrow-lanceshaped to ovate, mostly 2.5-8 cm long, 0.8-3.5 cm wide, tip pointed to long-pointed, base wedge-shaped to flat, margins with fine hairs. Both surfaces of the leaves are velvety, and the leaf-stalk is 3-10 mm long. Flowers are borne in a dense, cyme up to 4 cm long, carried on a 0.2-2.5 cm long stalk, at the end of branches. Flowers stalks are 0.5-1 mm long. Flowers are usually 1.5-2 mm long, purplish blue or rarely white. Anthers protrude out. Fruit is ellipsoid about 1.5-2 mm long, crowned by sepals, usually falling entire. Sumatra Knoxia is found in Indomalaya region, peninsular India and Sri Lanka. It is also found in the Himalayas. Flowering: September-October.

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The flower labeled Sumatra Knoxia is ...