×Sedeveria is an intergeneric hybrid genus in the family Crassulaceae (order Saxifragales), comprising succulent plants that arise from crosses between Sedum and Echeveria. The nothogenus was established by the American botanist Eric Walther and formally published in Cactus and Succulent Journal (Los Angeles) in 1953. The hybrid designation is reflected in the name: the prefix × (the nothogenus mark) precedes Sedeveria, which blends the names of the two parent genera — Sed- from Sedum and -everia from Echeveria.
Plants in this group typically display a combination of traits drawn from both parent genera: the compact, fleshy rosette form characteristic of Echeveria alongside the hardier, often smaller-leaved habit associated with Sedum. Like both parents, ×Sedeveria members are drought-tolerant succulents with thick, water-storing leaves that display varied coloration ranging from green to grey-blue and reddish tones, particularly in full sun or under temperature stress.
×Sedeveria sits within the stonecrop family Crassulaceae, one of the most speciose families of succulent plants, and belongs to the order Saxifragales. Well-known members include Sedeveria hummelii and Sedeveria 'Jet Beads', both widely cultivated as ornamental succulents. The genus is grown primarily for its decorative rosettes and its tolerance of dry, bright conditions that make it suited to container culture, rock gardens, and low-water landscaping.
Etymology
The name Sedeveria is a portmanteau of its two parent genera: Sedum and Echeveria. The intergeneric hybrid status is formally denoted by the nothogenus prefix ×, giving the full name ×Sedeveria E.Walther. The genus was described by American succulent botanist Eric Walther in 1953.
Taxonomy Notes
×Sedeveria is a nothogenus — a genus whose members are all of intergeneric hybrid origin — resulting from crosses between species of Sedum and Echeveria, both in tribe Sedeae of the family Crassulaceae. It was published by E. Walther in Cactus and Succulent Journal 25: 20 (1953). Molecular phylogenetic studies have shown that Echeveria and Sedum are not clearly monophyletic and cluster together, which contextualises why their hybrids share intermediate morphology. GBIF recognises multiple backbone entries for the name, reflecting different checklist treatments, with the nothogenus notation ×Sedeveria used in the more precise sources.
Cultivation
×Sedeveria hybrids are popular ornamental succulents grown for their compact rosettes and attractive leaf coloration. Like their parent genera Sedum and Echeveria, they are drought-tolerant and prefer bright light with well-draining substrate. They are well-suited to container growing, rock gardens, and low-water landscaping schemes. Most can tolerate mild frost but perform best in frost-free or lightly frost-touched conditions.
