Strother |editor10=J.L. Zarucchi |volume=9: Magnoliophyta: Picramniaceae to Rosaceae |chapter-url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250100056}}</ref>
Strother, J.L. Zarucchi, editor, volume 9: Magnoliophyta: Picramniaceae to Rosaceae, chapter from eFloras website: http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250100056