Erect or ascending subscabrid perennial herbs. Leaves opposite or subopposite, simple. Inflorescence spike-like. Bracts small. Calyx tubular, 5-ribbed, with 4-5 mostly short teeth, persistent, enlarging and covering the fruit, usually contracted and ± beaked at the mouth. Corolla limb ± 2-lipped, with 5 unequal lobes. Fertile stamens 4, didynamous. Ovary 4-locular. Fruit eventually splitting into 2
subspherical cocci. Worldwide: 20 species in tropical and warm zones Zimbabwe: 2 taxa. |
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