Hedyotis cyanantha - Blue Hedyotis

Blue Hedyotis is an erect annual herb, branching below; root-stock stout, branching; stem 6-18 cm long, stiff, round, setaceous. Leaves are simple, stalkless, opposite or whorled, 1-1.5 x 0.2 cm, linear, aristate at tip, leathery, dotted, rigid, curled at margin, setaceous above and along midrib below; Flowers are borne in clusters in leaf-axils or at branch-ends, which are head-like cymes with 3-4 flowers. Flowers are stalkless or shortly stalked, 4-5 mm long; flower-stalk up to 1 mm long. Hypanthium is spherical, 0.7-1 mm long. Calyx limb 0.5-1 mm long, setaceous; sepals 4, 1-1.5 x 0.1-0.12 mm, triangular-lanceshaped, aristate at tip. Flower are 3-4 mm long, blue; tube 1-1.5 mm long, hairless inside; lobes 4, 2.5-3 x 1 mm, lanceshaped to linear-lanceshaped, 3 nerved, minute finely velvet-hairy inside, incurved at tip. Stamens 4, protruding, longer than flower lobes; filaments 3-3.5 mm long, attached near sinus of flower lobes, fringed with hairs at base; anthers oblong, 0.5-0.8 mm long. Ovary 0.5-0.8 mm long, ovules many; style slender, 4-5 mm long; stigma bifid, 0.5-1 mm long, linear, feathery. Capsules spherical or ovoid, 2-4 x 1.5-2 mm, notched at tip, subleathery, ribbed, dotted setaceous, with rigid calyx teeth, loculicidal on crown only; seeds 40-70, 0.1-0.15 mm, triangular, narrowly winged, netveined, very often round. Blue Hedyotis is found in Peninsular India and Sri Lanka.