C. sempervivum grows rather taller, its dull green rosettes shaded with brown, and the pink flowers coming as large clusters in early autumn.
Cobweb Houseleek (Sempervivum Arachnoideum) - One of the most singular of alpine plants, with tiny rosettes of fleshy leaves covered at the top with a thick white down, which intertwines itself all over the leaves like a spiders web.
Fringed Houseleek (Sempervivum Fimbriatum) - One of the most profusely blooming kinds, the dark rose-colored flowers appearing in summer on stems 6 to 10 inches high.
Glaucous Houseleek (Sempervivum Calcareum) - No finer Houseleek has ever been introduced than this, often misnamed S. californicum.
Hen-and-chicken Houseleek (Sempervivum Globiferum) - This grows in firm dense tufts, its little round offsets being so abundantly thrown off that they are pushed clear above the tufts, and lie on the surface in small brownish-green balls.
Houseleek, Hens and chicks (Sempervivum) - Succulent rock and alpine plants, of which the common Houseleek (S. tectorum), often seen on old roofs and walls, is the most familiar.
Mountain Houseleek (Sempervivum Montanum) - A dark green kind, smaller than the common Houseleek, the leaves forming neat rosettes, from which spring dull rosy flowers in summer.
Sand Houseleek (Sempervivum Arenarium) - Grown in dense patches, this plant has a lovely effect.
Sempervivum Triste - Distinct from other Houseleeks, as its rosettes of leaves are of a deep dull red, which makes it a handsome plant.
The fleshy leaves are often reduced to a more or less cylindrical structure, as in the stonecrops (Sedum), or form closely crowded rosettes as in the house-leek (Sempervivum).