CONTENTS 



PAGE 



Preface v 



Introduction xi 



Illustrated Key to the Genera of Orchids . . . xxiii 



I. Cypripedium 3 



II. Orchis 19 



III. Habenaria 24 



IV. POGONIA 65 



V. Arethusa 78 



VI. Epipactis 82 



VII. Gyrostachys 87 



VIII. LiSTERA 103 



IX. Peramium Ill 



X. Achroanthes izo 



XI. Leptorchis 125 



XII. Calypso 130 



XIII. Coilallorhiza 133 



XIV. Tipularia I4S 



XV. LiMODORUM 147 



XVI. Hexalectris 150 



XVII. Aplectrum 151 



Index ^SS 



