EXPLANATION OF THE ILLUSTRATION 
PLtate XVI. AmBLosToMA GRACILE Garay var. RO- 
pustuM C. Schweinf. 1, plant, one half natural size. 
2, flower expanded, five times natural size. 3, col- 
umn and lip from side, six times natural size. 
Drawn by E.mer W. Situ 
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