Selenicereus nelsonii Lectotype: Mexico. Locality unknown, from material sent by Dr J. L. Slater to C. Z. Nelson, of which cuttings were sent to Britton & Rose (US-2947536A) DNA Bank DB 40069 Mexico, Chiapas. Straße von Tuxtla Gutiérrez nach El Sumidero, km8., alt. 950 m, M. Kimnach 3239 (Herbarium Berolinense: B GT 0023610)