This website and the projects it supports would not be possible without the generous help and donations from scientific collaborators and institutes, private individuals and fellow Fagaceae enthusiasts from around the world. Materials on this website can be used for limited educational purposes, as long as the original source and this website are cited. Below you will find an overview of major contributors and collaborators in the creation and maintenance of this site. Where available, other useful websites are listed and we encourage you to visit these, as they provide valuable resources for the study of Fagaceae diversity and evolution, as well as other major tree families.

Interested to make a contribution to this website and be listed here? Please contact!

Thank you!


Welcome to

    Mr. Jean-Louis Hélardot, French Physician and specialist on Oaks, Maples, Conifers and Ashes.

Jean-Louis has long been an enthusiastic and highly skilled collector and grower of trees, particularly of Oaks. He is managing two superb and large websites which hold a wealth of information on his four main groups of interest, and on many of the arboreta and gardens with which he connects regularly. I am very grateful for his continued support in my projects and in building this website.

Oaks of the World: Click here!
Major tree families: Click here!


    Dr. Jan De Langhe, Dendrologist. Ghent University Botanical Garden, Ghent, Belgium.

Jan works as a dendrologist at Ghent University Botanical Garden in Belgium. His main activities consist of the identification of woody plants, and in particular the construction of vegetative identification keys to woody plants in European collections. Many of the species on this website have been meticulously photographed and prepared by Jan, and I am in debted to him for his generous contributions.

Belgian plant collections: Click here!
Botanical Garden Ghent University: Click here!
Arboretum Het Leen Eeklo: Click here!
JDL plant identification keys: Click here!
JDL plant identification keys: Click here!
JDL leaf illustrations OAK ICRA Checklist: Click here!


    Professor Tetzakazu Yahara, Dr. Shuichiro Tagane and their research team at the Laboratory of Ecological Science at Kyushu University, Fukuoka, Japan.

The research group of Professor Yahara at Kyushu University undertakes a broad array of studies in ecology ranging from evolutionary, behavioral and pollination biology to community phylogenetics and plant diversity throughout Asia. Throughout our collaboration, my work has benefited substantially from their work on tropical Asian plant families, and their contribution to this website with images and species data is fundamental to its ongoing development as a resource and research base. I am very grateful for their continued support.

Research Group @ Fukuoka: Click here!
Professor Tetzakazu Yahara:: Click here!
Dr. Shuichiro Tagane:: Click here!


    Mr. Gert Fortgens of Trompenburg Gardens and Arboretum, Rotterdam, the Netherlands.

Trompenburg Gardens and Arboretum has a history of over 150 years as a green heart under the smoke of Rotterdam. From its early beginnings as regularly flooded marshland, to drained and cultivated pasture, it was brought into botanical hands, first as private country park and arboretum, then slowly opening up to the general public with important additions of neighboring gardens and estates. New functions were added over the years and Trompenburg now forms an oasis of green quiet inside the bustling port city of Rotterdam. Gert has been the hortulanus and director since 1996 and has played an important part in the modernization of the facilities, arboretum and gardens. Our collaboration and his support for my work and the website is important in providing study materials, images and distribution information.

Trompenburg Gardens and Arboretum: Click here!
History of Trompenburg Gardens and Arboretum:: Click here!


    Mrs. Keiko Tokunaga, Japan. is proud to welcome and showcase fine botanical art pieces, created by Mrs. Keiko Tokunaga from Japan. Her designs cover both temperate as well as tropical Fagaceae, spanning many genera and different continents. Mrs. Tokunaga runs the website Click here, on which more information can be found about her work!

Donguriworld: Click here!


    Mr. Hoang Thanh Son, botanist, Silviculture Research Institute, Vietnamese Academy of Forest Sciences.

Hoang Thanh Son works as a botanist at the Silviculture Research Institute (SRI) of the Vietnamese Academy of Forest Sciences (Department Of Forest Plant Resources) in Hanoi. He is wel skilled in the identification and assessment of species diversity in the field and herbarium, in particular of families such as Begoniaceae, Balsaminaceae, Gesneriaceae, Annonaceae and Dipterocarpaceae. I am particularly grateful for his support in assessing and displaying the amazing diversity of Fagaceae species in Vietnam.


    Ms. Béatrice Chassé and Mr. Gérard Lionet, Arboretum des Pouyouleix, France.

Pouyouleix Arboretum is the largest oak collection in France, showcasing the incredible diversity in oaks with over over 300 species from around the world in a 25 hectare countryside landscape setting. The arboretum also hosts a wide array of trees and shrubs in other plant families. I’d like to warmly acknowledge Béatrice and Gérard for their contributions to this website and my ongoing work on the Asian oaks.

Arboretum des Pouyouleix, St.-Jory-de-Chalais, Dordogne, France: Click here!


    Research funding and technical support.

Some components of the data on this webportal are/were supported with funding or technical support. I would like to acknowledge: