Rhiza (from ῥίζα 'root') is a genus of moths of the family Noctuidae. The genus was described by Staudinger in 1889.

Species Subgenus Rhiza Rhiza sergia (Püngeler, 1901) western Turkestan, Mongolia Rhiza commoda Staudinger, 1889 Armenia, Turkestan, Mongolia Rhiza idumaea (Püngeler, 1901) Palestine Rhiza schlumbergeri (Püngeler, 1905) Turkestan Rhiza stenoptera (Boursin, 1970) Subgenus Gryphadena Kusnezov, 1908 Rhiza indigna (Christoph, 1887) Turkey Rhiza minuta (Püngeler, 1900) southern Urals, western Kazakhstan, Turkmenistan, Afghanistan Subgenus Graphantha Ronkay, Varga & Fábián, 1995 laciniosa species group Rhiza laciniosa (Christoph, 1887) Turkey, Turkestan, Mongolia Rhiza calligrapha (Ronkay & Varga, 1989) gnorima species group Rhiza gnorima (Püngeler, 1906)

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