Annual or perennial herbs or subshrubs, parasitic or hemiparasitic. Leaves sessile, alternate, scale-like or ± linear. Flowers bisexual, solitary or in cymes, each flower subtended by 1, often conspicuous, bract which is often adnate to the pedicel or peduncle and 2 bracteoles or (in T. atrum and T. fastigiatum) by an involucre of 4 or more bracts. Perianth (3-4-)5-lobed, often with conspicuous external glands on the perianth tube below the sinuses of the lobes. Stamens as many as lobes; anthers (in ours) attached to lobes by tufts of hairs. Ovary with 3 ovules. Stigma capitate. Fruit a nut, rarely fleshy, usually 10-ribbed, crowned with the persistent perianth. Worldwide: 325 species in the Old World Botswana: 5 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| dissitum N.E.Br.[DD] | N | |
| goetzeanum Engl. | SE | Description, Image |
| megalocarpum A.W. Hill | ||
| myriocladum Baker | ||
| resedoides A.W. Hill |