VASCULAR PLANTS. 125 



i. Ceratophyllum, L. 



Only genus. Characters of the order. 



DIVISION II. MONOCOTYLEDONE^). 



SERIES I. C0R0LLIFL0R.3E. 



Perigonium 2x3 parted. Ovary 3 carpidia, 

 syncarpous in different degrees. 



ORDER XXXH. GYNANDR^l. 



Family XCIII. Orchideae. 

 Placenta3 parietal. 



1. Epipactis, Haller. 



Anther 1, persistent, not connate with the 

 column; pollinia 2, attached to the common 

 gland. Perigonium spreading; labellum genic- 

 ulate, inferior part concave. Ovary contorted 

 only at the base; column short, terete. 



U. caulescent; flowers in a loose few-flowered 

 raceme. 



2. Spiranthes, Richard. 



Anther 1, persistent, not connate with the 

 column; pollinia 2, attached to the common 

 gland. Perigonium oblique; labellum enclos- 

 ed, canaliculate, embracing with its base the 

 short column. 



U . flowers forming a spiral spike. 



