Lindernia parviflora

Small annual herbs, 5–25–(40) cm tall; stems thin, erect, simple to densely diffuse branched, often rooting at nodes, glabrous or sparsely pubescent. Leaves obviously 3-palminerved, somewhat uninerved or pinninerved; sessile, lamina ovate, lanceolate or elliptic, 0.3–2 x 0.3–0.8 cm, apex acute to acuminate or often obtuse, base cruneat or truncate, margins entire or minutely 1–3-serrate teeths, glabrous. Flowers solitary and axillary; pedicel 0.7–1.7 cm long. Calyx tubular, 1.5–3 mm long, 5-lobed; lobes green with obviously dark line color outside, divided almost to the base linear-lanceolate, apex acute, glabrous. Corolla white or pale blue with dark line markings along to the corolla tube, 4–6 mm long; upper lip ovate, emarginsate, 1.5–3 mm wide; lower lip 3-ovate lobes, 3–4 mm wide. Stamens 2 posterior fertiles, 2 anterior staminodes; posterior filaments straight, glabrous, 0.9‒1.2 mm long; anterior filaments shortly filliform, 0.3 mm long, distinctly linear spur, papillose, 0.3‒0.5 mm long; cleistogamous flowers not present. Capsules oblique, narrowly ellipsoid, glabrous, 3–5 x 1.5–2 mm, slightly longer than calyx lobes, acuminate or joined with style. Seeds numerous, fusiform to cylindric, 0.21‒0.58 x 0.13‒0.21 mm, sulcate with prominent rib, slightly concave and irregular ridges