1. Not having a floral envelope or perianth

Antonym: chlamydeous

• Iron Lady
• iron lung
• iron maiden
• iron manganese tungsten
• iron mold
• iron mould
• iron oak
• iron ore
• iron out
• iron overload
• iron perchloride
• iron putty
• iron pyrite
• iron trap
• iron-gray
• iron-grey
• iron-storage disease
• iron-tree
• ironclad
• ironed
• ironic
• ironical
• ironically
• ironing
• ironing board