1	Stamens in 1 series, usually as many as petals; flowers always bisexual.		(2)
+	Stamens usually in 2 series, 2 × as many as petals; flowers sometimes unisexual and male flowers without stamens.		(5)
2 (1)	Leaves always opposite, joined to form a basal sheath; inflorescences axillary, often shorter than subtending leaf; plants not developing enlarged rootstock		1 Tillaea
+	Leaves alternate, occasionally opposite proximally; inflorescence terminal, often very large; plants sometimes developing enlarged, perennial rootstock.		(3)
3 (2)	Inflorescence with a distinct, elongated main axis forming a raceme or thyrse much longer than broad; carpels narrowed at base, free; basal leaves often densely hairy		4 Kungia
+	Inflorescence cymose with no distinct main axis, often broader than long; carpels broad at base, often ± connate; basal leaves often glabrous.		(4)
4 (3)	Plants with conspicuous basal leaf rosettes; corolla campanulate, petals initially erect then spreading above middle, ± S-shaped in longitudinal section		8 Sinocrassula
+	Plants without basal leaf rosettes, often ephemeral; petals rotate		12 Sedum
5 (1)	Flowers 4-merous and with prominent, persistent corolla tube completely enclosing follicles; leaves opposite.		(6)
+	Flowers 5- or 6(-12)-merous, rarely 3- or 4-merous (Rhodiola) and then petals free or joined at base only and not enclosing follicles; leaves alternate, opposite, or in a rosette.		(7)
6 (5)	Filaments inserted basally on corolla tube; flowers usually pendulous		2 Bryophyllum
+	Filaments inserted near or above middle of corolla tube; flowers erect		3 Kalanchoe
7 (5)	Carpels stipitate to substipitate or basally constricted or conspicuously attenuate, free.		(8)
+	Carpels sessile, base not constricted (slightly attenuate in some Rhodiola species) and usually connate (free in Sedum chuhsingense, S. semilunatum, and sometimes in S. przewalskii).		(9)
8 (7)	Plants perennial, usually with several to many flowering stems; basal leaves not in a conspicuous rosette; inflorescence formed from a terminal group of cymes, usually broader than long, sometimes with aditional cymes in axils of distal leaves		6 Hylotelephium
+	Plants monocarpic, with a single flowering stem; basal leaves in a somewhat conspicuous rosette, dying when plant flowers; inflorescence with an elongated main axis and numerous lateral cymules, sometimes a true raceme with cymules reduced to single flowers		5 Orostachys
9 (7)	Stems dimorphic with usually very stout caudex or rhizome, usually with brown or blackish, membranous, scalelike leaves, sharply differentiated from much more slender, erect or ascending, leafy flowering stems.		(10)
+	Stems not sharply dimorphic, proximally with well developed leaves, rarely plants stoloniferous.		(11)
10 (9)	Flowers bisexual; petals basally connate		7 Pseudosedum
+	Flowers unisexual or bisexual; petals free or nearly so		13 Rhodiola
11 (9)	Leaf rosette absent at anthesis; inflorescence terminal.		(12)
+	Leaf rosette conspicuous at anthesis; inflorescence axillary.		(13)
12 (11)	Leaves flattened, margin serrate or crenate; seed testa longitudinally costate or subsmooth		11 Phedimus
+	Leaves terete or semiterete in cross section, margin entire (4-8-dentate in Sedum rosthornianum and remotely dentate in S. engleri var. dentatum); seed testa reticulate or papillate-reticulate		12 Sedum
13 (11)	Petals yellow; basal leaf rosette almost as wide as inflorescences are long; plants glabrous throughout		10 Ohbaea
+	Petals white, pink, and/or red, (rarely pale yellow outside China); plants hairy or glabrous.		(14)
14 (13)	Plants glandular hairy or, if glabrous, flowers 6-8-merous; petals connate at base		9 Rosularia
+	Plants glabrous; flowers (3-)5-merous; petals free or almost so		13 Rhodiola