Pilosocereus colombianus

References

1. [1]The Cactaceae — Britton N.L. & Rose J.N. · The Carnegie Institution of Washington; Washington. · 1920 · http://www.biodiversitylibrary.org ↩︎An immense work in 4 volumes. Many of the botanical names are out of date, of course, but the book contains a wealth of information about the plants. It can be downloaded from the Internet.
2. [2]Enciclopedia de las Plantas Útiles del Ecuador — de la Torre, L., Navarrete H., P. Muriel M., Macía M.J. & Ba · Herbario QCA de la Escuela de Ciencias Biológicas de la Pontific · 2008 · ISBN 978-9978-77-135-8 ↩︎