Populus trichocarpa
（重定向自Black Cottonwood）
![](/Images/godic/202412/24/Populus_trichocarpa_058975415.JPG")
![](/Images/godic/202412/24/PopulusTrichocarpaRange5415.jpg")
![Male (pollen-producing) catkin and leaf buds (March 22)Sherwood, Oregon, USA](/Images/godic/202412/24/Black_cottonwood_male_catkin_and_leaf_buds5415.JPG")
![Seeds and Fluff of Cottonwood (July 1, 2012) Boise, Idaho, USA](/Images/godic/202412/24/Seeds_and_Fluff_of_Cottonwood5415.jpg")
Populus trichocarpa, the black cottonwood, western balsam-poplar or California poplar, is a deciduous broadleaf tree species native to western North America. It is used for timber, and is notable as a model organism in plant biology. Its full genome sequence was published in 2006. It is the first tree species to be sequenced.