(71) 
2. Corallorhiza. Labellaum not geniculate, 
adnate to the column. Aphyllous and 
and without chlorophyll. 
3. Spiranthes.—Labellum not geniculate, 
embracing the column with its base. 
Perigonium oblique. 
Il. Diandria, 
1. Cypripedium. 
Ill. Hexandria. 
1. Aristolochia. 
MONCECIA. 
J. Monandria, 
1. 
2. 
Euphorbia. — Involucre campanulate, 
sometimes 2-phyllous. Flowers umbel- 
late, androgynous. ¢ flowers without 
perigonium, stipitate, bracteate, 2 flow- 
ers single, central. Ovary 3-celled, styles 
3, each 2-cleft. 
Zostera.—Spathe elongated into a lamina. 
Spadix androgynous. Ovary 1-celled, 
l-ovulate. Fruita nutlet. Aquatic. 
Lilewa.—Flowers spicate. ¢, @, and 
androgynous spikes present, besides 
solitary axillary @ flowers. Aquatic. 
Najas. — Flowers axillary, solitary. 
flowers included in a spathe, ? flowers 
naked. Ovary 1, l-ovulate. Fruit 
drupaceous. Aquatic. 
