POLYPETALAE. 97 
(4) Stamens as many as petals and alternate 
with them, or fewer, or more numerous. 
Flowers hermaphrodite or polygamous, 
rarely unisexual, in the latter case leaves 
opposite. 163. 
163 (2) Stamens monadelphous, rarely free, but 
then as many as petals, and ovules more 
than 2 in each cell of the ovary. Shrubs 
or trees. Leaves alternate, not dotted. 
Style simple. Melraceae. 
(6) Stamens free. Ovules in each cell of the 
ovary 2, rarely more, but then stamens 
more numerous than the petals. 164. 
164 (a) Fruit drupaceous, but sometimes with a 
dehiscent epicarp. Seeds exalbuminous. 
Cotyledons contorted. Leaves almost 
invariably without dots, alternate. 
Trees or shrubs, abounding in balsam or 
resin. Style simple. Burseraceae. 
(6) Fruit various, but very seldom drupace- 
ous, and then seeds albuminous and coty- 
ledons plane. Leaves glandular-dotted. 
Shrubs or trees, more rarely herbs, in 
the latter case style simple. | 
Rutaceae. 
165 (a) Perfect stamens 1-10. 166. 
a) (4) Perfect stamens more than 10. 191. 
