Massimo Afferni & Marco Cristini, Gli ibridi naturali in habitat europeo del genere Sedum (Crassulaceae) – Piante Grasse 42:2 (2022)

Natural hybrids of genus Sedum are quite rare in Europe and a few of them have been little investigated since their discovery, This paper examines Sedum ×derbezii, ×engadinense, S. ×erraticum, and S. ×fuereri, offering a translation of their original descriptions and arguing that they should be considered as valid nothospecies until proved otherwise.