Spermacoce quadrisulcata (Bremek.) Verdc.

Annual ± glabrous herb 0.35–1.3 m. tall from a fibrous root; stems grooved, branched or ± simple.. Leaf-blades linear to linear-lanceolate, 2.6–8 cm. long, 1.5–9(–11) mm. wide, acute at the apex, cuneate at the base, ± scabrid or glabrous above; stipule-sheath 3–5 mm. long, with (3–)5–7 setae 1–3 mm. long; petiole ± obsolete.. Flowers in axillary clusters ± 6 mm. in diameter, 3–4-merous; bracteoles of fascicles of short fimbriae present.. Calyx-tube ellipsoid, 1–1.5 mm. long, glabrous; lobes very small, triangular, 0.25–0.3 mm. long, with ± ciliolate margins.. Corolla rose-violet or white with mauve lobes; tube funnel-shaped, 1.5–1.7 mm. long; lobes ovate-triangular, 1 mm. long.. Stamens with filaments exserted 0.4–0.8 mm.. Style exserted 0.8–1.2 mm.; stigma subcapitate.. Capsule oblong-ellipsoid, 2–3 mm. long, 1 mm. wide, glabrous, crowned with the minute calyx-teeth.. Seeds narrowly oblong, (1.8–)2–2.4 mm. long, (0.5–)0.75–0.8 mm. wide, 0.5–0.6 mm. thick, rugulose-pitted, grooved ventrally, the groove widened at the base and with a white granular aril.. Fig. 50/16, p. 342.