3°6 
PHARMACEUTICAL BOTANY 
upright, in epiphytic types, often forming pseudobulbs. Leaves 
alternate, entire, parallel-veined, sheathing at base, rarely reduced 
to yellowish or pale scales in saprophytes. Flowers irregular, usu¬ 
ally attractive, entomophilous, arranged in elongated spikes or 
racemes, trimerous. Sepals, three usually similar; petals three of 
which two often resemble sepals, third is variously, often greatly 
