26 KEY TO PLANTS. 
16 (a) Leaves opposite, exstipulate. Flowers 
dicecious or polygamous. Male flowers 
destitute of a perianth. Style simple, 
with a 2-lobed stigma. Ovules in each 
cell 2. Seeds albuminous. Shrubs or 
trees. Stamens 2. Oleaceae. 
(b) Leaves alternate, stipulate. Flowers 
moncecious. Male flowers furnished 
with a perianth. Styles 2. Ovules in 
each cell 1. Seeds exalbuminous. 
Shrubs or trees. Extra-tropical regions. 
Cupulrferae. 
17 (a) Ovary 3-celled. Styles 3, or 1 with 3 or 
6 stigmas. Fruit 3-celled, capsular. 
Perianth of the male flowers valvate or 
wanting. Ovule in each cell 1, rarely 2, 
pendulous. Euphorbiaceae. 
(b) Ovary 4-celled. Styles 2 or 4, or a bilo- 
bed sessile stigma, Fruit 4-celled, inde- 
hiscent. 18. 
18 (a) Herbs. Flowers solitary, rarely in spikes 
containing both male and female flowers. 
Perianth of the male flowers 2-4-partite 
and valvate in bud, or wanting. Styles 
2 or 4 Ovule 1, pendulous. Seeds 
albuminous. leaves opposite, exstipu- 
late. Halorageae. 
