Mammillaria trichacantha subsp. duwei (Rogoz. & P.J.Braun) Mottram in J. Mammillaria Soc. 40: 8. 2000
Mammillaria trichacantha subsp. duwei in J. Mammillaria Soc. 40: 8. 2000
is new combination for Mammillaria duwei in Kakteen And. Sukk. 36: 164. 1985