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 Mozambique: 13 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| benthamii Baker | N,MS/T | |
| brevipes Pax | Description, Image | |
| furialis Bojer | MS | Description, Image |
| glabrata (Müll. Arg.) Pax & K. Hoffm. var. glabrata | GI,M | |
| glabrata (Müll. Arg.) Pax & K. Hoffm. var. hispida Radcl.-Sm. [End] | M | |
| incisifolia Prain | M | |
| kirkiana Müll. Arg. | N,Z,MS | Description, Image |
| minor Sond. | M | |
| okanyua Pax | N,Z,T,GI,M | Description, Image |
| rupestris Sond. | GI,M | |
| shirensis Prain var. shirensis [NrEnd] | Z | |
| shirensis Prain var. glabriuscula Radcl.-Sm. [End] | N | |
| wahlbergiana Prain | M |