24 KEY TO PLANTS. 
11 @ Perianth valvate in the bud. Stamens as 
many as perianth-segments, and alter- 
nate with them, Seed exalbuminous, 
with a straight embryo. Herbs or 
undershrubs. Flowers moncecious, all 
or only the male ones in heads. Style 
undivided in the male flowers, 2-partite 
or with 2 stigmas in the females. 
Compositae. 
(b) Perianth imbricate in the bud. Stamens 
as many as perianth-segments and oppo- 
site to them, or fewer. Seed with an 
abundant albumen and a curved embryo. 
Leaves entire or sinuate. 
Chenopodiaceae. 
12 (a) Ovules 2. Trees or shrubs, with whorled 
scales instead of leaves. Flowers spi- 
cate. Male flowers with 1-2 perianth- 
segments and 1 stamen. Style short, 
with 2 long stigmas. ‘Tropics and 
Australia. Caswarineae. 
(b) Ovules 4 or more. Trees or shrubs, with 
perfect and alternate leaves, or herbs. 13. 
13 (a4) Ovules 4. Flowers dicecious; male 
flowers spicate, females solitary. Fruit 
drupaceous. Seedsalbuminous. Shrubs 
or trees. Leaves coriaceous, exstipulate. 
