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