Sideroxylon lanuginosum subsp. oblongifolium
in Organization for Flora Neotropica, Fl. Neotrop. 52: 169. 1990,.
Leaves: petiole glabrate or sparsely hairy, hairs gray to white; blade dull adaxially, 52–97 mm, abaxial surface densely to sparsely villous, hairs white to gray.
Phenology: Flowering Jun–Jul.
Habitat: Upland and floodplain forests, prairie margins
Elevation: 300-1300 m
Ark., Ill., Kans., Ky., La., Mo., Okla., Tex.
Subspecies oblongifolium generally occurs in the mid-continent region and is characterized by white to gray indument on the abaxial leaf surfaces. Hair color varies from gray to white among some specimens from Texas and northern Mexico.