1. ‘Such Bigeneric cross plants do occur rarely in nature, and have at times also been artificially created in the horticultural field.’ ‘Pink dawn (Chitalpa tashkentensis), a Bigeneric hybrid between the narrow-leaved desert willow (Chilopsis linearis) and the broad-leaved catalpa tree (Catalpa bignonioides).’

2. The legend of "big catalpa spirit' of Qin was widely Broadcasted since Qinji of the War ring States to Odd Records of the Six Dynasties" 30