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Editor's Picks

Past IOS President Allen Coombes, Curator of Scientific Collections at Puebla University Botanic Garden, discusses leaf variability in Quercus ceirpes (still image from the documentary)
A new documentary by Maricela Rodríguez Acosta
Website Editor | Feb 17, 2026
Quercus miyagii acorn and dried leaves
A rare oak endemic to the Ryukyu Islands of Japan
Elion Jam | Feb 16, 2026
A moss-covered oak (Quercus orocantabrica) in Mata de Albergaria, Peneda-Gerês National Park, Portugal  © Amit Zoran
Steve Potter reviews a new book that features oaks
Steve Potter | Feb 11, 2026

Plant Focus

Quercus canariensis in Cornwall Park, Epsom, Auckland, New Zealand, the champion specimen in New Zealand, planted in the 1920s, 27.2 m tall with a trunk diameter of 209 cm (G. Collett pers. comm. 2026)  © Gerald Collett
Antonio Lambe shares his views on this threatened oak native to Iberia and North Africa

Ed Holm (1930 - 2018)

Edmond Holm

Ed Holm lived in Redwood City, California and was born on 4 September 1930 and died 1 January 2018. He spent his career with San Mateo High School teaching biology, horticulture, field biology, and desert ecology, and he had been the president of the district teachers' association there. When he retired in 1993 he began working part time at a nursery in Redwood City assisting customers, writing their newsletter, consulting, and preparing landscape designs. Following the 1997 meeting he became the Journal archivist for IOS. All of the extra Journal copies that were printed were shipped to him, and along with warehousing them he filled orders involving new members as well as back issues for many years. Besides being a long-time member of IOS he was a member of the California Horticulture Society and the California Native Plant Society and a former president and trustee of the Saratoga Horticulture Foundation. Ed did not seek the limelight and truly was a man for the trees—his work behind the scenes for IOS helped us become one of the greatest plant societies on planet Earth.      

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