humbertii from Humbert; named after Jean-Henri Humbert (1887-1967), professor of botany who explored Madagascar and is the author/editor of the ’Flora de Madagascar’. (Keraudren-Aymonin, M. & G.G. Aymonin, Candollea 37: 129-156. 1982). Hochreutiner, B.P.G., Bull. Mus. Hist. Nat. (Paris) ser. 2. 20: 474 (1948).