52 KEY TO PLANTS. 
pound leaves, or trees with entire or 
dentate leaves. Flowers dicecious, rarely 
polygamous. Styles 3, bifid, or 4 
Europe, Asia, America. Datisceae. 
97 (a) Ovule in each cell 1. 98. 
($3) (6) Ovules in each cell 2 or more.* 103. 
98 (a) Ovary-cells and styles or stigmas 2. 99. 
(2) Ovary-cells and styles or stigmas 3 or 
more. 101. 
99 (a) Perianth in the male flowers wanting, in 
the female flowers a narrow, dentate 
limb. Seeds exalbuminous. Trees or 
shrubs. Leaves stipulate, alternate. 
Flowers moncecious, the males in cat- 
kins, the females in spikes or heads. 
Ovules pendulous. Europe, Asia, North 
America. Cupuliferae. 
(6) Perianth in all flowers more or less corol- 
line. Seeds albuminous. JHerbs or 
undershrubs, more rarely shrubs or 
trees, and then leaves exstipulate. 
100. 
100 (a) Perianth-leaves separate down to the 
* Compare Dioscoreaceae, belonging to Monocotyledons, 
but bearing frequently net-veined (and exstipulate) leaves. 
They have unisexual, usually dicecious flowers, 6 perianth- 
leaves, and 3 or 6 stamens. 
