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1. Any of numerous orchids of the genus Pterostylis having leaves in a basal rosette and green flowers often striped purple, brown or red with the dorsal sepal incurved to form a hood
   - 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
   - helmetflower

Derived forms: helmet orchids

Type of: orchid, orchidaceous plant

Part of: Coryanthes, genus Coryanthes, genus Pterostylis, Pterostylis

Encyclopedia: Helmet orchid