Vegetative key to the families

LEAVES REDUCED TO SCALES ON THE AERIAL STEMS
Saprophytic herbs (one a climber) usually without chlorophyll Orchidaceae
Plants epiphytic on trees, logs, rocks
Leaves short, usually no more than 5 times longer than broad
Pseudobulbs usually present. Lateral sepals dilated at the base and united with the projecting foot of the column to form a spur. Labellum not spurred