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The flowers of BACKEBERGIA MILITARIS (Audot) H. Bravo:

Allen, S. F. ; Prior, D. A. ; Stubbings, H. G.
The National Cactus and Succulent Journal.  28 (1973)  3 - p. 66-67 , 1973
Link: https://www.jstor.org/stable/42789357