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Editor's Picks

Julianne Skai Arbor
We were shocked to learn that Julianne Skai Arbor, also...
Website Editor | Oct 26, 2026
Oak decline in Iran
Over the past two decades, the Zagros forests have been...
Mehdi Pourhashemi | Oct 10, 2026

Plant Focus

Quercus afares, Kew, © James MacEwen
The only oak species endemic to Africa is rare in cultivation. It shouldn't be.

An Updated Infrageneric Classification of the North American Oaks

IOS members Paul Manos (Duke University) and Andrew Hipp (The Morton Arboretum) have just published a subsectional classification of North American Red and White Oaks. The paper, open-access in the journal Forests, uses the phylogenetic work that Hipp, Manos, and their many collaborators have published over the past several years to identify nine clades within the White and Red Oaks that warrant recognition at the subsectional level. The paper names formal subsections and provides descriptions and ecological/taxonomic commentary, including implications of ongoing phylogenetic work. You can download the PDF here.

Phylogenetic tree