Stachytarpheta indica Vahl

Annual sometimes somewhat subsucculent herb 9–60(–120) cm. tall, with glabrous unbranched or branched stems.. Leaves oblanceolate to narrowly oblong in outline, 2–9(–13) cm. long, 0.3–3.5(–6) cm. wide, subacute at the apex, attenuate at the base into a 1 cm. long petiole with a few hairs at base and on junction across stems, ± remotely coarsely serrate.. Spikes 4–35 cm. long; bracts elliptic to lanceolate, 5–5.5 mm. long, 1–1.5 mm. wide, sometimes obscurely ridged, acuminate, often ± spreading in older inflorescences.. Calyx 4–4.5 mm. long, the apex appearing bifid from outside.. Corolla deep to light blue, mauve or lavender, the tube and throat often white; tube 5 mm. long; limb 7.5 mm. wide, the lobes rounded, 2.5–3 mm. long and wide.. Style 5 mm. long, just exserted; stigma green.. Fruit pale brown turning black, oblong, 3.5 mm. long, 1.5 mm. wide, reticulately ridged towards apex, longitudinally ribbed beneath, slightly beaked at apex.

A tropical plant. It grows in many tropical places. It grows along the edges of rivers and small lakes. It can be in flooded rice fields.

Can be grown by seedlings.