Distribution map
Molecular data
Quercus douglasii on GenBank NCBI
Online Plant Databases
Quercus douglasii on EFLORAS
Quercus douglasii on Encyclopedia of Life
Quercus douglasii on ePIC RBG Kew
Quercus douglasii on GBIF
Quercus douglasii on IPNI
Quercus douglasii on The Plant List
Quercus douglasii in the online Kew Herbarium Catalogue
Quercus douglasii in the online MNHN Paris Herbarium Catalogue
Quercus douglasii in the online Naturalis Leiden Herbarium Catalogue
Quercus douglasii on Tropicos
Quercus douglasii on Wikispecies
Quercus douglasii on JSTOR Global Plants
Quercus douglasii on EUROPEANA Collections
Scanned TYPES
TYPES of Quercus douglasii on JSTOR Global Plants
TYPES of Quercus douglasii on Kew Herbarium Catalogue
TYPES of Quercus douglasii on MNHN Paris
Search for TYPES of Quercus douglasii in the online Naturalis Leiden Herbarium Catalogue
Images
Quercus douglasii on Google Image Search
Online libraries
Quercus douglasii in Biodiversity Heritage Library
Search for Quercus douglasii on Botanicus.org
Scientific literature (ongoing)