was a Japanese botanist, author of several papers and monographs on phytogeography including work on

rose A rose is either a woody perennial plant, perennial flowering plant of the genus ''Rosa'' (), in the family Rosaceae (), or the flower it bears. There are over three hundred Rose species, species and Garden roses, tens of thousands of cultivar ...

s and

Amygdaloideae Amygdaloideae is a subfamily within the flowering plant family Rosaceae. It was formerly considered by some authors to be separate from Rosaceae, and the family names Prunaceae and Amygdalaceae have been used. Reanalysis from 2007 has shown that ...

(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.

Biography

Gen-ichi Koidzumi was born in

Yonezawa Yonezawa City Hall is a city in Yamagata Prefecture, Japan. , the city had an estimated population of 81,707 in 33,278 households, and a population density of 150 persons per km2. The total area of the city is . Yonezawa is most famous for i ...

Yamagata Prefecture is a Prefectures of Japan, prefecture of Japan located in the Tōhoku region of Honshu. It has a population of 1,005,926 (1 February 2025) and an area of 9,325 Square kilometre, km2 (3,600 Square mile, sq mi). Its neighbours are Akita Prefectu ...

in 1883. After graduating from the

Sapporo Agricultural College was a school in Sapporo, Hokkaidō established in September 1875 for the purpose of educating students in the agriculture industry. History The first president of the college was Zusho Hirotake. Dr. William S. Clark, a graduate of Amherst C ...

, he studied biology at

Tokyo Imperial University The University of Tokyo (, abbreviated as in Japanese and UTokyo in English) is a public university, public research university in Bunkyō, Tokyo, Japan. Founded in 1877 as the nation's first modern university by the merger of several Edo peri ...

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 , or , is a national research university in Kyoto, Japan. Founded in 1897, it is one of the former Imperial Universities and the second oldest university in Japan. The university has ten undergraduate faculties, eighteen graduate schools, and t ...

, where he remained (other than for a tour of the

herbaria A herbarium (plural: herbaria) is a collection of preserved plant specimens and associated data used for scientific study. The specimens may be whole plants or plant parts; these will usually be in dried form mounted on a sheet of paper (called ...

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 (APG) is a scientific journal of plant taxonomy and botany published by the (formerly by the Societas Phytogeographica of Kyoto). The journal was established along with the Societas Phytogeographica in 1932 by Gen-ichi Koidzumi. According to the ...

''. Koidzumi died in his hometown of Yonezawa in 1953. According to the

International Plant Names Index The International Plant Names Index (IPNI) describes itself as "a database of the names and associated basic bibliographical details of seed plants, ferns and lycophytes." Coverage of plant names is best at the rank of species and genus. It inclu ...

, in total he published over 1,600 new botanical names.

Published works

* 1956. ''Plants of Jaluit Island (Pacific surveys report / U.S. Army, Corps of Engineers, Far East)'' * 1952. ''The Big Button Palm which produces the ivory nut ( eports- USGS, Pacific Geological Surveys)'' * 1930. , 115 pp. * 1928. ''Plantae Novae Amami-Ohsimensis nec non Insularum adjacentium: 1 Phytogeographical notes on the flora of the Loochoo Archipelago. 2 Description of new species''. 19 pp.

Biography

Published works

References

Further reading