Euphorbia decaryi Guillaumin in Bull. Mus. Hist. Nat., sér. 2, 6: 120. 1934.

Typus: MADAGASCAR. Prov. Toliara: Fort-Dauphin, sables des dunes du Vinanibe, 10.VII.1932, Decary 10056 (holo-: P [P00077958]!).

= Euphorbia francoisii Leandri in Not. Syst. (Paris) 12: 161. 1946. Typus: M ADAGASCAR. Prov. Toliara: env. de Fort-Dauphin, sables entre le Pic St-Louis et la mer, 20.IX-6.XI.1928, Humbert 5978 (holo-: P [P00077987]!; iso-: P [P00077988, P00077989]!), syn. nov.