Bumelia lanuginosa (Michaux) Persoon var. rigida A. Gray in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 2(1): 68. 1886; B. lanuginosa subsp. rigida (A. Gray) Cronquist; B. lanuginosa subsp. texana (Buckley) A. E. Murray; B. lanuginosa var. texana (Buckley) Cronquist; B. texana Buckley; Sideroxylon lanuginosum var. rigidum (A. Gray) B. L. Turner

Leaves: petiole hairy to glabrate, hairs white to gray; blade dull adaxially, 15-50 mm, abaxial surface densely to sparsely villous or glabrate, hairs white to gray.

Flowering Jun-Jul. Upland forests, woodlands, scrublands; 400-2000 m; Ariz., N.Mex., Okla., Tex.; Mexico (Coahuila, Nuevo León, Tamaulipas).

Subspecies rigidum occurs in the southwestern portion of the range and has leaf indument ranging from tomentose to glabrate. Variation patterns are especially complex in southern and western Texas and in northern Mexico.