I am unable to find any description which agrees with the 
character of this plant, and have thus been induced to give it 
a name expressive of the almost pure white hue of its blos- 
soms. 
Fig. 1. Front view of a flower. Fig. 2. Flower, with the petals and lip 
spread back. Fig. 3. Anther-case. Figs. 4, 5. Pollen-masses.—All more 
or less magnified. 
