Abstract
The taxonomy of Chilean Cactaceae is notoriously difficult (see e.g., Duarte et al. 2014). Molecular data, and phylogenetic approaches, provided answer to better understand the natural classification of cacti (see e.g., Nyffeler 2002, Edwards 2005, Nyffeler & Eggli 2010, Ritz et al. 2012, Schlumpberger & Renner 2012, Larridon et al. 2015, 2018). As part of an ongoing revision of the Chilean Cacti, which is part of the “Modern Flora of Chile” initiative, nomenclatural novelties are needed in Eulychnia Philippi (1860: 23), Leucostele Backeberg (1953: 36) and Maihueniopsis Spegazzini (1925: 86) (Cactaceae Juss.).