Texas Vascular Plant Checklist:  Simaroubaceae
The Quassia Wood Family
(Magnoliophyta, Magnoliopsida, Rosidae)

 Ailanthus
   altissima (P. Mill.) Swingle (tree of heaven, copal-tree)

 Castela
   erecta subsp. texana (Torr. & Gray) Cronq.

 Holacantha
   stewartii C.H. Muell. (stewart's crucifixion thorn)