Croton hypochalibaeus Baill., Bull. Mens. Soc. Linn. Paris 2: 862. 1890, as 'hypochalibaeum'

Berry, Paul E., Kainulainen, Kent & Ee, Benjamin W. van, 2017, A Nomenclator of Croton (Euphorbiaceae) in Madagascar, the Comoros Archipelago, and the Mascarene Islands, PhytoKeys 90, pp. 1-87 : 39

70. Croton hypochalibaeus Baill., Bull. Mens. Soc. Linn. Paris 2: 862. 1890, as 'hypochalibaeum'

Croton squamiger var. acutifolius Müll.Arg. in A.P.de Candolle, Prodr. 15(2): 523. 1866, syn. nov. Type. Madagascar. in sylvis ins. Madag., s.d., W. Bojer s.n. (holotype: P [P00133274]!, isotype: M [M0110356]!).

Croton alceicornu Radcl.-Sm., Gen. Croton Madag. Comoro 70. 2016, syn. nov. Type. Madagascar. Prov. Toamasina: Ambatovy, 18°51'34"S, 48°18'25"E, 3 Mar 1997, P. Rakotomalaza et al. 1220 (holotype: K!; isotype: MO!).

Croton antanosiensis var. fianarantsoae Radcl.-Sm., Gen. Croton Madag. Comoro 42. 2016, syn. nov. Type. Madagascar. Prov. Fianarantsoa: Ranomafana National Park, 7 km S of the National Road 25 W of Ranomafana, 21°15'30"S, 47°25'00"E, 31 Mar 1993, D. Turk et al. 378 (holotype: K!; isotype: G [G00414720]!, MO!, P [P00418629]!).

Croton oligostemon Radcl.-Sm., Gen. Croton Madag. Comoro 45. 2016, syn. nov. Type. Madagascar. Prov. Antsiranana: Analamazava, Binara Range, SW of Daraina (Vohemar), 13°15'S, 49°38'E, 26 Apr 1990, D. Meyers 90 (holotype: K!; isotypes G00414721!, MO!, P [P00433104]!).

Type.

Madagascar. sin. loc., s.d., R. Baron 5635 (lectotype, designated by Kainulainen et al. 2016, pg. 344: K [K001040371]!; isolectotypes: P [P00133213]!, P [P00133661]!) .

Habit and distribution.

Shrubs; montane forests of Madagascar (Antananarivo, Antsiranana, Fianarantsoa, Toamasina, Toliara).

Notes.

Leandri (1939) considered Croton hypochalibaeus to be a synonym of C. noronhae , whereas Radcliffe-Smith (2016) considered it to be a synonym of C. jennyanus . Croton hypochalibaeus was accepted by Kainulainen et al. (2016), based on a number of distinguishing morphological and ecological criteria. It is one of the most wide-ranging Croton species in Madagascar.