Chromosome numbers of 21 taxa inLobeliaL. andCyphiaBerg, are reported, the majority being new records. 2n = 18 inCyphiais a new generic report. The new speciesLobelia paludigenaThulin (Zaire),L. kundelungensisThulin (Zaire),L. cheranganiensisThulin (Kenya) andL. corniculataThulin (Swaziland and Natal) are described. The distributions of these species, as well as ofL. thermalisThunb., are mapped.L. kalobaënsisE. Wimm. ex Thulin is validated. The new combinationsL. trullifoliaHemsl. ssp.delicatula(Compton) Thulin andL. flaccida(Presl) A. DC. ssp.gnmvikii(T. C. E. Fries) Thulin are made. Typifications are provided for the following names:L. stuhlmanniiSchweinf. ex Stuhlm.,L. gregorianaBak. f.,L. fervensThunb.,L. ancepsL. f. andL. depressaL. f
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