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Databases & Directories
	Quercus Portal Quercus Portal provides access to various databases regarding genetic and genomic resources and information. It includes also a dynamic user interface allowing the submission of complex queries across all data bases (Global Search). Additionally a static section of the portal is devoted to general...Visit site
	USDA Plant Hardiness Zone Map In January 2012, the USDA Agricultural Research Service released a new edition of the American Plant Hardiness Map. The previous edition was released in 1990. Two new zones 12 and 13 have been added to this 2012 edition. The zones are based on 1976-2055 weather data, that is 30 years of data. ...Visit site

Editor's Picks

The Harvard University Herbaria hosted a novel Oak Taxonomy...

Jeannine Cavender-Bares | Apr 21, 2026

Visits to three collections of Quercus in Buenos Aires...

Morgan Santini | Apr 05, 2026

On April 1st, the very day he turned 103, a great friend...

Francisco Garin Garcia | Apr 05, 2026

Roderick Cameron and Carlos Vila-Viçosa give an account of this intriguing species from northwestern Iberia with a complex taxonomic and...

Databases & Directories
	Quercus Portal Quercus Portal provides access to various databases regarding genetic and genomic resources and information. It includes also a dynamic user interface allowing the submission of complex queries across all data bases (Global Search). Additionally a static section of the portal is devoted to general...Visit site
	USDA Plant Hardiness Zone Map In January 2012, the USDA Agricultural Research Service released a new edition of the American Plant Hardiness Map. The previous edition was released in 1990. Two new zones 12 and 13 have been added to this 2012 edition. The zones are based on 1976-2055 weather data, that is 30 years of data. ...Visit site