What is "endostemon"

Endostemon is a genus of plants in the Lamiaceae, first described in 1910. It is native primarily to eastern Africa, with some species in central and southern Africa, the Arabian Peninsula, Madagascar, and the Indian Subcontinent.

1. Endostemon albus A.J.Paton, Harley & M.M.Harley - Kenya, Tanzania, Mozambique
2. Endostemon camporum (Gürke) M.R.Ashby - Kenya, Tanzania
3. Endostemon ctenoneurus Harley - Kenya, Somalia
4. Endostemon glandulosus Harley & Sebsebe - Ethiopia
5. Endostemon gracilis (Benth.) M.R.Ashby - Kenya, Somalia, Tanzania, Yemen
6. Endostemon kelleri (Briq.) Ryding ex A.J.Paton & Harley - Kenya, Somalia, Ethiopia
7. Endostemon leucosphaerus (Briq.) A.J.Paton, Harley & M.M.Harley - Somalia, Ethiopia
8. Endostemon membranaceus (Benth.) Ayob. ex A.J.Paton & Harley - Cameroon, Angola, Central African Republic
9. Endostemon obbiadensis (Chiov.) M.R.Ashby - Somalia
10. Endostemon obtusifolius (E.Mey.) N.E.Br. - from South Africa north to Angola and Tanzania
11. Endostemon racemosus Ryding, A.J.Paton & Thulin - Somalia
12. Endostemon stenocaulis (Hedge) Ryding, A.J.Paton & Thulin - Somalia
13. Endostemon tenuiflorus (Benth.) M.R.Ashby - eastern + southern Africa, Madagascar, Arabian Peninsula
14. Endostemon tereticaulis (Poir.) M.R.Ashby - widespread across much of tropical Africa, also Yemen + Saudi Arabia
15. Endostemon tomentosus Harley & Sebsebe - Somalia
16. Endostemon tubulascens (Briq.) M.R.Ashby - Angola
17. Endostemon usambarensis M.R.Ashby - Tanzania
18. Endostemon villosus (Briq.) M.R.Ashby - central Africa
19. Endostemon viscosus (Roth) M.R.Ashby - India, Assam, Sri Lanka
20. Endostemon wakefieldii (Baker) M.R.Ashby - Kenya