Many varieties of sakamai that were typical sakamai until the Taisho period but were 'extinguished' due to the drastic change in rice-polishing technique and unstable conditions in Japan.
大正まで一般的な酒米であったにもかかわらず、昭和における精米技術の劇的な変化や国情不安などによって、もはや「絶滅」してしまった酒米の種類も多い。