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.
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.
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.
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.
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.
C. sempervivum grows rather taller, its dull green rosettes shaded with brown, and the pink flowers coming as large clusters in early autumn.
Sempervivum Triste - Distinct from other Houseleeks, as its rosettes of leaves are of a deep dull red, which makes it a handsome plant.
Glaucous Houseleek (Sempervivum Calcareum) - No finer Houseleek has ever been introduced than this, often misnamed S. californicum.
Sempervivum has about so species in the mountains of central and southern Europe, in the Himalayas, Abyssinia, and the Canaries and Madeira; S.
Sylvestris; Phloxes, like P. subulata, with its varieties setacea, Nelsoni, nivalis; the single-flowered varieties of the Primrose, Primula vulgaris; the Polyanthuses; Pyrethrum Parthenium aureum, called Golden Feather; Sempervivum calcareum; the pinkflowered Silene pendula; self-coloured varieties of the Pansy, V.