Kalmar "Populus tremuloides" tana nufin wani nau'in bishiyar bishiya da aka fi sani da quaking aspen. Memba ne na dangin willow kuma asalinsa ne ga yankuna masu sanyi na Arewacin Amurka, gami da yawancin Kanada da Arewacin Amurka. Sunan "tremuloides" ya fito ne daga kalmar Latin "tremulus," ma'ana rawar jiki ko girgiza, yana nufin yanayin ganyen bishiyar da ke rawar jiki a cikin 'yar iska.