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Plants 5-10 cm tall, glabrous. Stems erect, simple, terete. Leaves sessile, 1-2.5 × 0.5-0.8 mm, base obtuse, margin membranous, apex acuminate. Flowers 1-3. Pedicel 0.7-1.7 cm, slender. Calyx 4-5 mm; lobes spreading, lanceolate, 3.5-4.5 mm, margin broadly membranous, apex acuminate, midvein keeled. Corolla yellow, tubular, 8-10 mm; lobes elliptic, 4-5 mm, margin entire, apex obtuse. Filaments linear, 1.8-2 mm; anthers ellipsoid, 0.8-1 mm. Style linear, 3.5-4 mm; stigma lobes orbicular. Capsules ellipsoid to subglobose, 2.5-3 mm. Seeds dark brown, ellipsoid to globose, 0.2-0.3 mm. Fl. and fr. Oct.
Corolla tube 4–6 mm. long, cylindrical or funnel-shaped, narrowed around the ovary, enlarged from the point of the insertion of the filaments; lobes ovate-elliptic to oblong, 3–6 mm. long, attenuate-acute and sometimes apiculate at the apex.
Stamens inserted near the throat of the corolla; filaments 1.5–2 mm. long, reaching the middle of the corolla lobes; anthers 0.7–2 mm. long, oblong, ellipsoid, without apical gland.
Calyx almost without tube; lobes 5, 3–7 mm. long, linear-lanceolate, subulate-lanceolate to ovate-lanceolate, narrowly winged on the keel (wing c. 0.1 mm. broad).
Flowers pale yellow, yellow to gold-yellow, terminal, solitary or in few to many-flowered cymes, pedicellate; pedicels 0.5–13 mm. long.
Ovary oblong-ellipsoid, 2–3.5 mm. long; style 2–3 mm. long; stigma 0.5–1.2 mm. long, globose-ellipsoid, to oblong-ellipsoid, bilobed.
Leaves 2–6.5 x 0.5–1.5 mm., oblong-ovate to triangular-lanceolate, acute at the apex.
Stem slender, filiform, unbranched or branched above, 4-ridged.
Seeds 0.5–0.15 mm. in diam., cubical; testa faveolate.
Erect annual herb (sometimes parasitic) 4–40 cm. tall.
Capsule oblong-ellipsoid 3–5 mm. long.
