2096 



A TEXTBOOK OF THEORETICAL BOTANY 



I. Ophrydoideae. Anthers erect. Pollen powdery or granular. 



Included in this tribe are the north temperate Habenaria, Platanthera, 

 Orchis, Aceras, Op/irys, Herminiinn and some forty more, mostly widely 

 distributed. 



The genus Habenaria contains about 400 species which occur in tropical 

 and temperate regions. Many are highly decorative and have been culti- 

 vated in greenhouses. At one time this genus included several British 

 species which were among our most beautiful and remarkable of orchids. 

 Recently these species have been referred to other genera, for the original 

 genus Habenaria has now been split up into a number of smaller genera. 

 Among these British species may be mentioned Leiicorchis albida {Habenaria 

 albida), the Small White Habenaria; Coeloglossiim viride{H. viridis), the Frog 

 Orchid; Platanthera bifolia {H. bifolia), the Butterfly Orchid; P. chlorantha 

 {H. chlorantha). Large Butterfly Orchid; and Gymnadenia conopsea {H. 

 conopsea), the Scented Orchid. As will be realized from the English names 

 these orchids are of remarkable form, often with long, narrow perianth 

 segments which together with the essential organs superficially resemble 



Fig. 2032. — Platanthera bifolia. ButterHy Orchid. Inflores- 

 cence. 



