Appearance
Important distinguishing features are: 1. The lip appears "plump" and rounded with a noticeably low slung waistline; 2. It has a strongly recurved lip ( with a yellow/orange margin) which will often form a pleat at the back (as scolopaxoides) but more usually sits like a pair of half closed curtains; and 3. It has long petals, which are generally concolourous with the sepals and importantly, contiguous at the baseNaming
Until 1994, O. calypsus was considered simply a variety of O. heldreichii but since that time has been given full species status.References:
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