MARCH. 75 
Stigmas, four or eight, awl-shaped. Seeds numerous, small, 
ege-shaped, downy at the top. 
The trees of this genus are now in flower. Four species are 
found in this country, one of which is Populus tremula, or 
the Aspen, so well known by the fluttermg motion of its 
leaves in the wind. The P. alda, White Poplar; P. canes- 
cens, Gray Poplar; and P. migra, Black Poplar, are princi- 
_ pally found in moist ground near rivers, and are all well 
known by their peculiar shape. The first has a rather smooth 
bark, and leaves white and cottony underneath. The wood 
is used for coarse work. ‘The second has silvery smooth 
bark, producing better wood, and the third, a thick, blackish 
bark, affording a light valuable wood. 
Dia@cta. MoNADELPHIA. 
MOoNOCHLAMYDE®, CONIFER. 
TAXUS. (Yew.) 
Generic Character. Barren flower; catkins oval, scaly at 
the base. Stamens numerous. Fertile flower solitary, scaly at 
the base. erry, fleshy, perforated at the extremity. 
Taxus Baccata. Common Yew. This tree does not 
grow very tall, but it attains a considerable diameter. The 
