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Capsule of very characteristic shape, both loculicidal and septicidal, cordate and bilobed at the base, with the fertile part produced into a very distinct compressed obtuse central beak.
Leaves paired, narrowly (rarely broadly) elliptic or elliptic-lanceolate; stipules with 2–4 fimbriae from a short base.
Ovary 2-locular, each locule with few ovules; style not exserted; stigma bifid, the lobes linear.
Flowers small, not dimorphic, in small, usually few-flowered terminal dichasial inflorescences.
Seeds few, compressed subglobose, bluntly angular, distinctly reticulately pitted.
Corolla tube very short; lobes ovate, throat hairy.
Calyx tube ovoid; lobes 4, triangular-lanceolate.
Annual herb with short erect branched stems.
