 He discovered that "Prunus × yedoensis" is a crossbreed of two wild species of Japanese cherry; "Prunus spachiana" forma "ascendens" (Edo higan) and "Prunus speciosa" (Oshima zakura) by crossing experiments.He was also known as a researcher on Japanese morning glory and Nicotiana.He was born in Hyōgo Prefecture, Japan in 1903.