with the midrib. Flowers arranged in several whorls, 
towards the extremities of the branches, large, and striking 
from the contrast of colour between the upper and lower 
lip: each whorl subtended by a pair of bracteas, which, in 
the upper ones, are obsolete, Calyx campanulate, five-fid ; 
the segments ovate-acuminate. Corolla with the tube white, 
swollen on the upper side. Lower lip large, pendent, pur- 
ple; upper lip erect, white. 
