Annual herb with short, erect, branched stems. Leaves paired, narrowly (rarely broadly) elliptic or elliptic-lanceolate; stipules with 2-4 fimbriae from a short base. Flowers small, not dimorphic, in small, usually few-flowered terminal dichasial inflorescences. Calyx: tube ovoid; lobes 4, triangular-lanceolate. Corolla: tube very short; lobes ovate, throat hairy. Ovary 2-locular, each locule with few ovules; style not exserted; stigma bifid, lobes linear. Fruit a capsule of very characteristic shape, both loculicidal and septicidal, cordate and bilobed at base, with fertile part produced into a very distinct compressed obtuse central beak. Seeds few, compressed-subglobose, bluntly angular, distinctly reticulately pitted.
Monotypic genus: Mitrasacmopsis quadrivalvis Jovet, trop. Africa and Madagascar; sthn trop. Afr.: Angola, Zambia.
Diotocranus Bremek.; White: 406 (1962).