published on the vascular anatomy of orchid flowers. 
Even this meagre information is confined to the study 
of only teratological material. The present study is an 
attempt to understand the structural complexities of 
normal orchid flowers. 
Material and Methods 
Vascular anatomy of the flowers of the following gen- 
era have been studied; the number of species investigated 
in this study is indicated by a digit in parenthesis after 
each genus: 
Diandrae 
Cypripedilinae Paphiopedilum (2) 
Cypripedium (1) 
Monandrae 
Ophrydinae Habenaria § Platanthera (1) 
Habenaria § Euhabenaria (6) 
Habenaria § Peristylus (2) 
Satyrium (1) 
Neottiinae Vanilla (1) 
Zeuxine (1) 
Coelogyninae Coelogyne (2) 
Pholidota (1) 
Liparidinae Oberonia (2) 
Phajinae Spathoglottis (1) 
Cyrtopodiinae Geodorum (1) 
Eulophia (2) 
Dendrobiinae Dendrobium (8) 
Eria (1) 
Bolbophyllinae Bulbophyllum (1) 
Cy mbidiinae Cymbidium (1) 
Sarcanthinae Diplocentrum (2) 
Luisia (1) 
Saccolabium (3) 
Vanda (1) 
Aerides (2) 
Rhynchostylis (1) 
