helmet orchid
       n 1: 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 [syn: greenhood]
       2: any of several orchids of the genus Coryanthes having
          racemes of a few musky-scented waxy flowers with a
          helmet-shaped lip process [syn: helmetflower]