Pachycereus grandis

References

1. [1]Taxonomic Revision of Pachycereus (Cactaceae) — Arias S. & Terrazas T. · 2009 · http:// http://www.bioone.org/doi/full/10.1600/036364409787602384 ↩︎An excellent, comprehensive paper, it also lists plant uses.
2. [2]The Cactus Family — Anderson E.F. · Timber Press; Portland, Oregon · 2001 · ISBN 0-88192-498-9 ↩︎An excellent work, giving botanical descriptions of virtually all the cacti, together with their range (but not their habitats) and sometimes also a photo. it also contains a long chapter detailing the many uses of cacti and another on cultivation..
3. [3]IUCN Red List of Threatened Species — http://www.iucnredlist.org/ ↩︎A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat.