viernes, 19 de abril de 2013

Opuntia Leptocarpa-Opuntia Velutina-Opuntia Megacantha




The Cactaceae : descriptions and illustrations of plants of the cactus family (1919)
Author: Britton, Nathaniel Lord, 1859-1934; Rose, J. N. (Joseph Nelson), 1862-1928
Volume: v.1
Publisher: Washington : Carnegie Institution of Washington
Year: 1919-1923.