(71) 



2. Corallorliiza. Labellam not geniculate, 

 adnata to the column. Aphyllous and 

 and without chlorophylJ. 



3. Spirantlies. — Labellum not geniculate, 

 embracing the column with its base. 

 Perigonium oblique. 



II. Diandria. 



1. Cypripedium. 



III. Hexandria. 



1. Aristolochia. 



MONffiCIA. 

 I. Monandria. 



1. Euphorbia. — Involucre campanulate, 

 sometimes 2-phyllous. Flowers umbel- 

 late, androgynous. $ flowers without 

 perigonium, stipitate, bracteate, ? flow- 

 ers single, central. Ovary 3-celled, styles 

 3, each 2-cleft. 



2. Zostera. — Spathe elongated into a lamina. 



Spadix androgynous. Ovary 1-celled, 

 1-ovulate. Fruit a nutlet. Aquatic. 



3. Lihea. — Flowers spicate. $ , $ , and 

 androgynous spikes present, besides 

 solitary axillary ? flowers. Aquatic. 



4 Najas. — FloAvers axillary, solitary. S 

 flowers included in a spathe ? flowers 

 naked. Ovary 1, 1-ovulate. Fruit 

 drupaceous. Aquatic. - 



