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Annual herbs, mostly very slender and unbranched, 4-15 cm high. Leaves 1-5 mm long, linear-lanceolate to ovate-lanceolate, the lower ones usually reduced and scale-like. Flowers usually solitary, terminal; rarely plants branched and 3-5-flowered; bracts lanceolate, small. Calyx of 5 segments, each 4-8 mm long, 0.75-2 mm broad, narrowly lanceolate to narrowly ovate-lanceolate, acuminate or long-acuminate, the sides hyaline, joined for 0.25-1 mm, keeled or with a very narrow wing, which is slightly broader towards the base. Corolla yellow (fide Killick) or pale yellow (fide Bruce); tube 5-8 mm long; lobes 4-10 mm long, 1.75-5 mm broad, ovate-elliptic to ovate-orbicular, clawed, rounded or subacute. Filaments very short to 0.75 mm long, inserted in the corolla-sinuses; anthers 1.25-2.25 mm long, each with a stipitate apical gland. Style and stigma 4.5-8.5 mm long with a large stigmatic swelling below the middle; stigma large, 2-lobed with more or less tongue-shaped lobes.
Annual herb, 0.03-0.16 m high; slender to filiform, often unbranched. Leaves 1-5 mm long, linear-lanceolate to ovate-lanceolate; lower reduced and scale-like. Flowers solitary, terminal, sometimes 3-5-flowered, bracteate. Caly x: segments 5, narrowly lanceolate, sides hyaline, joined for 0.25-1.00 mm, keeled or narrowly winged. Corolla yellow; tube 5-8 mm long, clawed. Stamens short, inserted in corolla sinuses; anthers with stipitate, apical gland. Style with large swelling below middle; stigma 2-lobed, tongue-shaped. Fruit a capsule.
Annual herb, 40-150 mm high. Stems very slender, erect. Leaves in relatively few pairs, internodes prominent; blade linear to narrowly ovate, 1-5 mm long. Flowers: usually solitary, terminal; filaments inserted in corolla sinuses; anthers with a stipitate apical gland; style with large stigmatic swelling below middle; corolla with tube 5-8 mm long, yellow or pale yellow; Aug., Feb.-Apr.
