Key to the endemic Malagasy genus Socratina

1. Flowers buds c. 1-2 mm in diam. just prior to anthesis; corolla tube covered by a sparse indument; splitting distally between each of the five lobes at anthesis................. .............................................................. S.keraudreniana

1a. Flowers buds c. 4-6 mm in diam. just prior to anthesis; corolla tube covered by a dense indument, splitting mostly unilaterally at anthesis .................................................... 2

2. Mature leaves and petiole covered by a russet indument; corolla with a dense uniform external indument ............... ................................................................ S.bemarivensis

2a. Mature leaves and petiole glabrescent; corolla with two different external indument types: a uniform, relatively sparse indument over the entire surface, and with conspicuous villous fringe of long trichomes on the outer surface of its corolla longitudinal along each suture...................... .............................................................. S.phillipsoniana

Systematics

Socratina Balle in Adansonia ser. 2, 4: 135. 1964 .

Typus: Socratina bemarivensis (Lecomte) Balle