Stamens included, inserted in the middle of the corolla tube; filaments 5, subclaviform, alternate with 5 short protuberances; anthers 3.5 mm. long, narrowly ellipsoid with a triangular-rhombic to narrowly clavate apical 0.4 x 0.6 mm. long gland; basal glands 0.3 mm. long, stipitate, sometimes absent.
Corolla tube 10–30 x 1–2 mm., subcylindric, the lower portion enlarged in fruit, narrowed around the ovary, widening again from the point of insertion of the filaments, puberulous on the external face; lobes 5–25 x 2–12 mm., ovate-lanceolate, attenuate or apiculate at the apex.
Flowers white, pale cream to yellowish, solitary, terminal, pedicellate; pedicels 1.5–13 cm. long; calyx with 4–5 segments, 7–20 mm. long, lanceolate, acuminate, with a dorsal wing, 0.5–0.6 mm. broad near the middle.
Leaves in 4–8 pairs, 5–25 x 2–8 mm., oblong-lanceolate to linear-lanceolate, acute or subobtuse at the apex.
Ovary 5.5–8 mm. long, ellipsoid; style 4–9 mm. long; stigma papillate.
Capsule 7.5–10 mm. long, narrowly ovoid to ellipsoid.
Seeds 0.20–0.25 mm. long, cubical; testa faveolate.
Delicate annual herbs up to 60 cm. tall.
Stem simple or branched, 4-ridged.
White flowers.
Herb