Gen-ichi Koidzumi (小泉 源一, Koizumi Gen'ichi, 1 November 1883 – 21 December 1953) was a Japanese botanist, author of several papers and monographs on phytogeography including work on roses and Amygdaloideae (Rosaceae), maples (Aceraceae), mulberries (the genus Morus), and many other plants. His name is sometimes transliterated as Gen’ichi or Gen-Iti, or as Koizumi.
|Born||1 November 1883|
|Died||21 December 1953(aged 70)|
|Author abbrev. (botany)||Koidz.|
Gen-ichi Koidzumi was born in Yonezawa in Yamagata Prefecture in 1883. After graduating from the Sapporo Agricultural College, he studied biology at Tokyo Imperial University from 1905, continuing his studies there under Matsumura Jinzō, and receiving his doctorate in 1916. In 1919, he was appointed assistant professor at Kyoto Imperial University, where he remained (other than for a tour of the herbaria of Europe and the United States from 1925 to 1927) until his retirement in 1943; he was promoted to full professor in 1936. In 1932, he founded the Societas Phytogeographica and the journal Acta Phytotaxonomica et Geobotanica. Koidzumi died in his hometown of Yonezawa in 1953. According to the International Plant Names Index, in total he published over 1,600 new botanical names.