Erect or scrambling or twining, monoecious (rarely dioecious) perennial herbs or shrubs, with stinging hairs. Leaves alternate, stipulate, often cordate. Flowers in racemes, usually mostly male with 1-2 females at the base. Bracts conspicuous, persistent. Petals 0. Male flowers with 3 sepals and 3 stamens. Female flowers with 3 or 6 pinnate or palmate sepals, becoming enlarged in fruit. Ovary 3-locular. Derivation of name: named after the German botanist Hieronymus Bock, whose Latin name was Tragus, 1498-1554. Worldwide: 100 species in tropical and warm areas Zimbabwe: 14 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| benthamii Baker | N,S | |
| brevipes Pax | N,W | Description, Image |
| brevipes-benthamii-okanyu intermediates | N,S | |
| dioica Sond. | S | |
| furialis Bojer | E | Description, Image |
| gardneri Prain | W,C | Description, Image |
| incisifolia Prain | E,S | |
| kirkiana Müll. Arg. | N,W,C,S | Description, Image |
| mazoensis Radcl.-Sm. [End] [DD] | N | Description, Image |
| okanyua Pax | N,W,C,E,S | Description, Image |
| plukenetii Radcl.-Sm. | E | |
| prionoides Radcl.-Sm. | W,C,E,S | |
| rhodesiae Pax | N,C | |
| tenuifolia Benth. | E |