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
   "The helmet orchid's unique hooded flowers captivated orchid enthusiasts";
   - 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
   "The helmet orchid's complex structure evolved to attract specific pollinators";
   - helmetflower

Derived forms: helmet orchids

Type of: orchid, orchidaceous plant

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

Encyclopedia: Helmet orchid