Sideroxylon lanuginosum Michaux ssp. rigidum (A. Gray) T.D. Pennington. Edwards Plateau Bully, Chittimwood. Phen: Apr-Jun. Hab: On limestone or gypsum, especially along river bluffs. Dist: C. and nc. TX (especially Edwards Plateau) west to se. AZ and south into Mexico.

Origin/Endemic status: Native

Synonymy: = FNA8, K3, K4, Corogin (2015), Govaerts, Frodin, & Pennington (2001), Pennington (1991); = Bumelia rigida (A.Gray) Small – Clark (1942); = Sideroxylon lanuginosum Michx. var. rigidum (A.Gray) B.L.Turner; > Bumelia lanuginosa (Michx.) Pers. ssp. rigida (A.Gray) Cronquist var. rigida – Cronquist (1945a); > Bumelia lanuginosa (Michx.) Pers. ssp. rigida (A.Gray) Cronquist var. texana (Buckley) Cronquist – Cronquist (1945a); > Bumelia lanuginosa (Michx.) Pers. var. rigida A.Gray – Tx; > Bumelia lanuginosa (Michx.) Pers. var. texana (Buckley) Cronquist – Tx; < Sideroxylon lanuginosum Michx. – Mex

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