Rotheca, Raf.

Callmander, Martin W., Phillipson, Peter B., Wearn, James A. & de Kok, Rogier P. J., 2013, Adieu Adelosa Blume (Lamiaceae): Further observations on Rotheca Raf. for Madagascar, Candollea 68 (2), pp. 316-320 : 317

Key to the Malagasy species of Rotheca

1. Inflorescence developing on old wood early in the season, generally produced on leafless stems before vegetative growth has commenced; corolla tube shorter than the corolla lobes .................................... Rotheca nudiflora

1a. Inflorescence developing on young growth during the growing season, at the same time or after the leaves, stems with leaves at time of anthesis; corolla tube many times longer than corolla lobes ............................................. 2

2. Calyx 2-2.5 cm in length at anthesis ............................... ........................................................... Rotheca mirabilis

2a. Calyx 0.5-1 cm in length at anthesis ............................... ...................................................... Rotheca microphylla