1	"Stamens as many as petals; leaves opposite"	Crassula
1	"Stamens twice as many as petals"	2
2	"Leaves alternate or rosetted; petals free or fused at base only"	Aeonium
2	"Leaves opposite or whorled; petals fused into a tube for at least half their length"	3
3	"Flowers 5-merous"	"Cotyledon: Cotyledon orbiculata"
3	"Flowers 4-merous"	4
4	"Flowers erect; filaments fused to corolla tube at or above middle"	"Kalanchoe: Kalanchoe spathulata var. spathulata"
4	"Flowers pendulous; filaments fused to corolla tube in lower third"	"Bryophyllum: Bryophyllum delagoense"