MONOCHLAMYDEAE. 47 
79 (2) Perianth imbricate in aestivation, more or 
less irregular, corolline. Leaves exstipu- 
late, entire. Anthers dehiscing by apical 
pores. Ovary 5-20-celled. LHvricaceae. 
(4) Perianth valvate or open in aestivation, 
regular, usually herbaceous. Leaves 
usually stipulate. 80. 
80 (a) Stamens 5-15, monadelphous, more rarely 
5,free. Dise wanting. Sterculiaceae. 
(4) Stamens numerous, free, inserted on the 
disc. Tropical America and Africa. 
Tiliaceae. 
81 (a) Aquatic plants. Perianth 3-lobed or re- 
duced to small scales or hairs. Seeds 
exalbuminous. Herbs, usually of a 
moss-like appearance. Styles 2-3. 
Podostemaceae. 
(0) Terrestrial plants. Perianth 4-5-lobed or 
-partite. Seeds albuminous, 82. 
82 (a) Herbs or undershrubs. Leaves undivided, 
entire or dentate. Styles and cells of 
the ovary 3-5. Seeds with a mealy 
albumen and a peripherical embryo. 
Ficoideae. 
(6) Herbs with divided leaves, or more 
frequently shrubs or trees. Styles and 
cells of the ovary 2. Seeds with a 
