1	"Leaves opposite with bases more or less connate; stamens as many as petals"	Crassula
1	"Leaves alternate, opposite or whorled, with bases free; stamens usually twice as many as petals"	2
2	"Leaves alternate or rosetted; petals free or fused at base only"	3
2	"Leaves opposite or whorled; petals fused into a tube for at least half their length"	4
3	"Leaves crowded in terminal rosettes; flowers 6–12-merous"	Aeonium
3	"Leaves alternate or loosely clustered toward branch-tips; flowers typically 4–5-merous (rarely to 9-merous)"	Sedum
4	"Flowers 4-merous; free portion of petals not or hardly recurved at anthesis"	Bryophyllum
4	"Flowers 5-merous; free portion of petals recurved at anthesis"	"Cotyledon {Cotyledon orbiculata}"