Mammillaria haageana subsp. elegans D.R. Hunt, Mammillaria Postscripts 6: 9 9 1997. (Syn: Mammillaria collina J.A. Purpus; Mammillaria elegans DC.; Mammillaria haageana var. collina (J.A. Purpus) T. Linzen et al; Neomammillaria collina (J.A. Purpus) C.E. Britton & Rose); Mammillaria haageana subsp elegans D. R. Hunt (syn: M. elegans DC.) from Delhi, displayed at DU Flower Show in February, 2010. References:
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