Verbatim text: Grant, V. and K. A. Grant. 1979. Systematics of the Opuntia phaeacantha group in Texas. Bot. Gaz. 140: 199–207.
Author: Grant, V., Grant, K.A.
Year: 1979
Title: Systematics of the Opuntia phaeacantha group in Texas
Journal: Bot. Gaz
Volume: 140
Pages: 199–207
PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/337076