1	"Leaves opposite, more or less fused at the base, usually with hydathodes along the margin; stamens in 1 whorl; flowers (3–)5(–9)-parted"	Crassula
1	"Leaves alternate, opposite or whorled, free (sometimes slightly basally fused in Kalanchoe), with a single apical hydathode; stamens in 2 whorls, double the number of petals, outer whorl opposite the petals (if 1-whorled, leaves never opposite); flowers (4–)5(–16)-parted"	2
2	"Flowers 4-parted; petals fused forming a tube"	3
2	"Flowers 5(–16)-parted (if ever 4-parted as in some Sedum species then petals free); petals usually free, or basally united, or forming a tube"	4
3	"Flowers pendulous; corolla usually broadly cylindrical to urn-shaped; filaments fused to the corolla tube in the lower third"	Bryophyllum
3	"Flowers erect and spreading; corolla tube narrowly cylindrical; filaments fused to the corolla tube at or above the middle"	Kalanchoe
4	"Inflorescence terminal"	5
4	"Inflorescence lateral"	11
5	"Flowers 6–16-parted; leaves usually in rosettes; leaf margins ciliate or pubescent"	6
5	"Flowers 5-parted (if ever 6–7-parted as in some Sedum species then leaves not in rosettes); leaves often distributed evenly along stem/branch length, occasionally in rosettes; leaf margins not ciliate or pubescent (or rarely in some Sedum species and then leaves not in rosettes or hairs distributed all over leaf surface)"	8
6	"Stem-forming plants, occasionally rosettes more or less stalkless (as in A. tabuliforme and A. canariense), flowers (6–)7–9(–16)-parted"	Aeonium
6	"Leaf rosettes stemless, leaves tufted; flowers 6–16-parted"	7
7	"Petals entire, star-shaped, spreading, flowers (8–)10–14(–16)-parted"	Sempervivum
7	"Petals more or less fimbriate, erect (flower bell-shaped), 6–7-parted"	Jovibarba
8	"Petals free or rarely basally fused, radially spreading; corolla not forming a tube (or very rarely)"	Sedum
8	"Petals fused; corolla forming a tube"	9
9	"Leaves opposite; flowers pendulous; sepals hairless; nectary cup-shaped"	Cotyledon
9	"Leaves alternate; flowers erect or spreading (pendulous in Adromischus phillipsiae); sepals with (or often with) club-shaped hairs; nectary disc-like"	10
10	"Leaves deciduous, inflorescence stalk with a gradual transition from leaves to bracts; petals fused for less than the full length of the tube"	Tylecodon
10	"Leaves alternate; inflorescence stalk with an abrupt transition from leaves to bracts; petals fused beyond the tube"	Adromischus
11	"Petals spreading radially from midway"	12
11	"Petals erect or only slightly spreading at apices"	16
12	"Petals with a pair of scale-like appendages at the base of stamens"	×Pachyveria
12	"Petals without a pair of scale-like appendages"	13
13	"Petals distinctly red- or brown-spotted"	Graptopetalum
13	"Petals not spotted"	14
14	"Petals free"	"Sedum suaveolens"
14	"Petals basally fused"	15
15	"Sepals reflexed"	Tacitus
15	"Sepals erect or adpressed"	Dudleya
16	"Petals with a pair of scale-like appendages at the base of stamens"	Pachyphytum
16	"Petals without a pair of scale-like appendages"	17
17	"Leaves awn-tipped or inflorescence with large leafy bracts, or petals spotted"	×Graptoveria
17	"Leaves not awn-tipped, inflorescence with small scattered bracts only, and petals not spotted"	18
18	"Corolla not rolled up in bud, usually strongly pentagonal; petals thick and fleshy, sharply keeled; sepals more or less spreading; leaves narrow-based, not readily detachable"	Echeveria
18	"Corolla rolled up in bud, slightly angled only; petals thin, scarcely keeled; sepals erect or adpressed; leaves broad-based, not readily detachable"	Dudleya