Ann. Mo. bot. Gdn 57(2): 179 (1971) [1970]. Basionym: Heppia omphaliza Nyl., in Eckfeldt, Bull. Torrey bot. Club 16(4): 106 (1889).
Basionym: Heppia omphaliza Nyl., in Eckfeldt, Bull. Torrey bot. Club 16(4): 106 (1889).