Sideroxylon lanuginosum subsp. rigidum (A. Gray) T.D. Penn. Sideroxylon lanuginosum subsp. rigidum (A. Gray) T.D. Penn., Fl. Neotrop. Monogr. 52: 169. 1990 sec. Pennington 1990=Bumelia riograndis Lundell in Contr. Univ. Michigan Herb. 8: 77. 1942 syn. sec. Govaerts 2013