1	"Annual; leaf < 1 cm; flower 1--5 mm"	2
1	"Generally perennial herb to shrub; leaf > 1 cm; flower generally > 10 mm (if annual, flower > 4 mm)"	3
2	"Basal, cauline leaves opposite, bases fused, +- sheathing; flowers 1 in axils of leaves; petals < 2 mm"	Crassula
2	"Basal leaves opposite, cauline alternate, bases free, not sheathing; flowers 1 or >= 2 in cyme, terminal; petals 1.3--5 mm"	Sedella
3	"Subshrub to shrub"	4
3	"Perennial herb (annual or biennial in <i>Sedum radiatum</i>)"	7
4	"Leaves alternate"	5
4	"Leaves opposite"	6
5	"Leaves ciliate, rosettes terminal; sepals 7--11"	Aeonium
5	"Leaves not ciliate, rosettes 0; sepals 5"	Sedum
6	"Leaves generally 2--4 pairs; petals fused, tube >> sepals"	"Cotyledon {Cotyledon orbiculata var. oblonga}"
6	"Leaves generally > 4 pairs; petals free or +- fused at base, tube 0"	Crassula
7	"Inflorescences axillary"	Dudleya
7	"Inflorescences terminal"	8
8	"Sepals, petals generally 5"	Sedum
8	"Sepals, petals generally 4"	9
9	"Flowers bisexual; stamens = sepals in number"	Crassula
9	"Flowers +- unisexual; stamens 2 &times; sepals in number"	"Rhodiola {Rhodiola integrifolia subsp. integrifolia}"