helmet orchid, n.
any of several orchids of the genus Coryanthes having racemes of a few musky-scented waxy flowers with a helmet-shaped lip process
<noun.plant>
helmet orchid helmetflower
any of numerous orchids of the genus Pterostylis having leaves in a basal rosette and green flowers often striped purple or brown or red with the dorsal sepal incurved to form a hood
<noun.plant>
greenhood helmet orchid