Sempervivum tectorum (Common houseleek)

5/12/2025 · Coastal Maine Botanical Gardens, Boothbay, Maine · ≈ 7 × 4½″ (17 × 11 cm)

5/12/2025 · Coastal Maine Botanical Gardens, Boothbay, Maine · ≈ 8 × 5″ (20 × 13 cm)

Kingdom	Plantae	Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin)
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Magnoliopsida	Dicotyledons—plants with two initial seed leaves
Subclass	Rosidae	Roses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more
Order	Rosales	Rose family and eight others
Family	Crassulaceae	Succulents that store water in leaves
Genus	Sempervivum	From Latin semper, ”always,“ and vivus, ”living“—”always living,“ because of the plant‘s robustness
Species	tectorum	Relating to the roofs of houses, this was a name used by Linnaeus for various Swedish plants that grew on thatched roofs