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 Zambia: 13 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| angolensis Müll.Arg. | W,C,S | |
| benthamii Baker | B,N,S | |
| brevipes Pax | B,N,W,E,S | Description, Image |
| descampsii De Wild. | S | |
| kirkiana Müll. Arg. | W | Description, Image |
| lasiophylla Pax & K.Hoffm. | B,N | |
| lukafuensis De Wild. | N,W | |
| micromeres Radcl.-Sm. [VU] | N | |
| okanyua Pax | B,W,C,E,S | Description, Image |
| petiolaris Radcl.-Sm. | B,N,W | |
| prostrata Radcl.-Sm. [VU] | N | |
| rhodesiae Pax | W,C | |
| stipularis Radcl.-Sm. | S |