; Sp. Pl. [Linnaeus] 1: 430 (1753)
Distribution: Temperate and subtropical Northern Hemisphere, especially Mexico (over 150), China (over 150), and Mediterranean, montane areas of tropics, Peru (1). The genus is very polyphyletic, and many other genera are embedded in it. Messerschmid et al. (2020) recommend to expand it to encompass all genera of the Tribus Sedeae (equivalent to Leucosceptrum and Acre clades)
= Aithales Webb & Berthel.; Hist. Nat. Îles Canaries (Phytogr.) 3(2,1): 178 (1840)
= Aizopsis Grulich; Preslia 56: 35 (1984)
= Altamiranoa Rose; Bull. New York Bot. Gard. 2: 31 (1903)
= Amerosedum Á.Löve & D.Löve; Taxon 34: 350 (1985)
= Balfouria (H.Ohba) H.Ohba; Evol. Syst. Crassulaceae 156 (1995) (homonym)
= Breitungia Á.Löve & D.Löve; Taxon 34(2): 350 (1985)
= Cepaea Fabr.; Enum. [Fabricius] 147 (1759)
= Chamaerhodiola Nakai; Rep. Exped. Manchoukuo, Sect. IV, 1 (Pl. Nov. Jehol.) 27 (1933)
= Chetyson Raf.; Ann. Gén. Sci. Phys. 7: 387 (1821)
= Clausenellia Á.Löve & D.Löve; Taxon 34(2): 350 (1985)
= Cockerellia (R.T.Clausen & C.H.Uhl) Á.Löve & D.Löve; Taxon 34(2): 351 (1985)
= Congdonia Jeps.; Man. Fl. Pl. Calif. [Jepson] 450 (1925)
= Corynephyllum Rose; N. Amer. Fl. [Britton et al., eds.] 22: 28 (1905)
= Diamorpha Nutt.; Gen. N. Amer. Pl. [Nuttall] 1: 293 (1818)
= Enchylus Ehrh.; Beitr. Naturk. [Ehrhart] 4: 147 (1789), opus utique oppr.
= Etiosedum Á.Löve & D.Löve; Taxon 34(1): 163 (1985)
= Gormania Britton; Bull. New York Bot. Gard. 3: 29 (1903)
= Helladia M.Král; Preslia 59(4): 309 (1987)
= Hjaltalinia Á.Löve & D.Löve; Taxon 34(1): 163 (1985) (nom. nov.)
= Keratolepis Rose ex Fröd.; Acta Horti Gothob. 10: App., 55 (1936 publ. 1935)
= Leucosedum Fourr.; Ann. Soc. Linn. Lyon, Sér. 2, 16: 384 (1868)
= Macrosepalum Regel & Schmalh. ex Regel; Izv. Imp. Obshch. Lyubit. Estestv. Moskovsk. Univ. 34(2): 25 (1882)
= Monanthella A.Berger; Nat. Pflanzenfam. [Engler & Prantl], 2. Aufl., 18a: 446 (1930)
= Mucizonia (DC.) A.Berger; Nat. Pflanzenfam. [Engler & Prantl], 2. Aufl., 18a: 419 (1930)
= Ohbaea V.V.Byalt & I.V.Sokolova; Kew Bull. 54: 476 (1999)
= Oreosedum Grulich; Preslia 56(1): 41 (1984)
= Poenosedum Holub; Folia Geobot. Phytotax. 19(1): 98 (1984)
= Procrassula Griseb.; Spic. Fl. Rumel. 1: 323 (1843)
= Sedastrum Rose; N. Amer. Fl. [Britton et al., eds.] 22: 58 (1905)
= Sempervivella Stapf; Bot. Mag. 149: t. 8985 (1923)
= Spathulata (Boriss.) Á.Löve & D.Löve; Taxon 34: 163 (1985)
= Telephium Hill; Brit. Herb.: 36 (1756), nom. illeg.
= Telmissa Fenzl; Pug. Pl. Nov. Syr. 14 (1842)
= Tetradium Dulac; Fl. Hautes-Pyrénées 321 (1867), nom. illeg.
= Tetrorum Rose; N. Amer. Fl. [Britton et al., eds.] 22: 59 (1905)
= Triactina Hook.f. & Thomson; J. Proc. Linn. Soc., Bot. 2: 90 (1858)
