Alnus sinuata (Regel) Rydb. (Betulaceae) is native to Alaska, Alberta, Aleutian Is., British Columbia, California, China North-Central, Colorado, Idaho, Japan, Kamchatka, Khabarovsk, Kuril Is., Magadan, Manchuria, Montana, Northwest Territories, Oregon, Primorye, Sakhalin, Washington, Wyoming, Yukon.
