What is "tetradenia"

Tetradenia is a genus of plants in the Lamiaceae family, first described in 1830. It is native to Africa, including Madagascar.

1. Tetradenia bainesii (N.E.Br.) Phillipson & C.F.Steyn - Zimbabwe, Mozambique, Swaziland, KwaZulu-Natal
2. Tetradenia barberae (N.E.Br.) Codd - Cape Province
3. Tetradenia brevispicata (N.E.Br.) Codd - Zimbabwe, Namibia, Botswana, Transvaal
4. Tetradenia clementiana Phillipson - Madagascar
5. Tetradenia cordata Phillipson - Madagascar
6. Tetradenia discolor Phillipson - Zambia, Zaire, Zimbabwe, Malawi, Tanzania
7. Tetradenia falafa Phillipson - Madagascar
8. Tetradenia fruticosa Benth. - Madagascar
9. Tetradenia galpinii (N.E.Br.) Phillipson & C.F.Steyn - southeast Africa from Tanzania to Swaziland
10. Tetradenia goudotii Briq. - Madagascar
11. Tetradenia herbacea Phillipson - Madagascar
12. Tetradenia hildeana Phillipson - Madagascar
13. Tetradenia isaloensis Phillipson - Madagascar
14. Tetradenia kaokoensis van Jaarsv. & A.E.van Wyk - Namibia
15. Tetradenia multiflora (Benth.) Phillipson - Ethiopia
16. Tetradenia nervosa Codd - Madagascar
17. Tetradenia riparia (Hochst.) Codd - southern Africa from Angola + Malawi to Swaziland
18. Tetradenia tanganyikae Phillipson - Malawi, Tanzania, Zambia
19. Tetradenia tuberosa T.J.Edwards - KwaZulu-Natal
20. Tetradenia urticifolia (Baker) Phillipson - eastern + central Africa from Sudan + Eritrea south to Zaire and Tanzania