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Background and Aims: Pachyphytum (Crassulaceae) is a genus endemic to central Mexico, consisting of hanging and succulent plants that grow on cliffs and slopes. The taxonomic information of Pachyphytum is included in general works on Crassulaceae and a series of articles describing new species. At a regional level, it is included in the treatment of the family Crassulaceae for the Flora del Bajio y de regiones adyacentes. The aim of this work is to name and describe a new species of Pachyphytum based on plants collected in the southeast of the state of Guanajuato. Methods: Excursions were realized to one of the localities in the Sierra de Penjamo from where the plant was registered, as well as to the type locality of Pachyphytum machucae . Descriptions of the collected plants and a comparative table were prepared, and the literature was searched for morphologically similar species. Key results: Pachyphytum confusum is proposed as a species new to science and is compared with P. machucae and P. glutinicaule which it resembles morphologically. The conservation status of Vulnerable (VU) is assigned. Conclusions: Despite the fact that Pachyphytum consists of 21 especies, it is difficult to interprete their relationships; in its last revision two sections were considered; Pachyphytum and Diotostemon ; the new species belongs to the first one. The specimens collected in the Sierra de Penjamo were previously confused with P. machucae , but their comparison showed significant differences in order to consider them as a distinct species. Pachyphytum glutinicaule , another species which it resembles, has a corolla longer than the calyx; however, both species show differences in its petals, bracts and leaves. The inconsistency of the infrageneric classification is discussed in several publications, which is emphasized by the discovery of Pachyphytum confusum .

Pachyphytum confusum (Crassulaceae), una especie nueva del suroeste del estado de Guanajuato, México