The term 'Poplar Species' refers to two species of trees in the Populus genus, namely ASPEN (5 letters) and ABELE (5 letters). ASPEN is a deciduous tree native to cold regions of the Northern Hemisphere, and is known for its white bark and quaking leaves. ABELE is a species of poplar native to Europe and western Asia, and is characterized by its tall, slender trunk and bright green leaves. Both species are widely used in landscaping and timber production.