TYPE: Equatorial Guinea (Rio Muni). Monte Alen National Park, Engong inselberg: 5 km NW from Engong village, 1°37'26'N, 10°17' 49"E, 1,100 m, 20 Jul 2001, Stevart 1020 (holotype: BRLU!; isotypes: MO!, K!, WAG!; photo of plant in the wild; photo of flower; photo of plant; illustration of type).