108 KEY TO PLANTS. 
Petals 6-8, very rarely 4-5. Trees or 
shrubs. Leaves alternate. Ovary half- 
inferior. Ovules several or many, 
parietal. Samydaceae. 
(2) Ovary several-celled. Seeds exalbumin- 
ous. Petals 5. Leaves alternate, with- 
out dots. Ovules in each cell 1-2. 
Rosaceae. 
199 (2) Shrubs. Calyx-segments valvate in 
aestivation. Petals 4-5. Ovules axile. 
Albumen fleshy. Leaves opposite. Ovary 
2-10-celled. Fruit capsular. Saaifrageae. 
(0) Herbs or undershrubs. Calyx-segments 
imbricate in aestivation. Petals numer- 
ous. Ovules parietal or basal. Albumen 
mealy. 200. 
200 (2) Aquatic plants with floating leaves on 
long radical petioles. Ovules attached 
to the dissepiments of the ovary. Fruit 
a berry. Embryo straight. Flowers 
solitary. Anthersadnate. Ovary many- 
celled. Nymphaeaceae. 
(0) Terrestrial plants with fleshy, usually 
opposite leaves. Ovules attached to 
basal or parietal placentas. Fruit a 
capsule. Embryocurved. Petals linear. 
Ovary 4-20-celled. Ficoideae. 
