There are multiple species of Poplar including Black Italian
poplar (P. Canadensis), Black poplar (P.nigra) and European Aspen
(P. tremula). Yellow-poplar (Liriodendron tulipifera), common in
the United States, is not actually part of the the true poplar
genus (Populus) but has similar traits. They are all considered a
light hardwood and range from 24 to 33 lbs./ft3 when air dried
(moisture content in the 10 - 15% range).