Hydrolea brevistyla Verdc.

Weak erect annual herb 7.5–30 cm. tall; stems ± compressed at base, almost winged in the dry state, decumbent below in some stouter specimens and rooting at the nodes, with a few minute hairs on the young parts.. Leaves pale green, lanceolate or elliptic to linear-oblong, 0.6–4.5 cm. long, 1–9 mm. wide, bluntly acute at the apex, cuneate at the base, glabrous; petiole obsolete or very short.. Cymes terminal, few–many-flowered; pedicels 2–4 mm. long.. Calyx micropuberulous; tube 1.2 mm. long; lobes ovate-lanceolate to lanceolate, 3.5–5 mm. long, 0.15–1.5 mm. wide.. Corolla deep blue, white at base; tube 0.8–1.3 mm. long; lobes oblong-elliptic, 2–2.5 mm. long, 1.3 mm. wide.. Anthers apiculate, 0.5–0.8 mm. long; filaments 1 mm. long.. Ovary 1.5 mm. long, the style and stigma together 0.5–1 mm. long.. Fruit oblong-ellipsoid, 2.8–3.5 mm. long, 2–2.5 mm. wide.