1. APG II 2003. See general references.
2. Behnke, H.D., Kiritsis, U., Patrick, S.J., Kenneally, K.F. 1996. Form-Pfs plastids, stem anatomy and systematic affinities of Stylobasium Desf. (Stylobasiaceae). A contribution to the knowledge of sieve-element plastids in the Rutales and Sapindales. Bot. Acta 109:346–359.
3. Carlquist, S. 1985. Vasicentric tracheids as a drought survival mechanism in the woody flora of southern California and similar regions: review of vasicentric tracheids. Aliso 11:37–68.
4. Chattaway, M.M. 1956. Crystals in woody tissues, part II. Trop. Woods 104:100–124.
5. Christensen, K.I., Hansen, H.V. 1998. SEM-studies of epidermal patterns of petals in the angiosperms. Opera Bot. 135:1–91.