Populus tomentosa x alba October 11, 2015December 24, 2022 BigfootLeave a comment Populus tomentosa x alba at Brenton Arboretum. Listed as a hybrid of Chinese White Poplar (Populus x tomentosa) and White Poplar Populus alba. Populus x tomentosa is said to be a cross between Populus alba × Populus adenopoda.