1	"Ovules attached to central column of the ovary (ovule placentation axile) "	2
1	"Ovules attached to outer wall of ovary or appearing to be attached at the base of the ovary (placentation parietal) "	3
2	"Plant annual or biennial"	Mesembryanthemum
2	"Plant perennial "	Aptenia
3	"Fruit fleshy, not splitting open at maturity (indehiscent) "	Carpobrotus
3	"Fruit splitting open at maturity (a dry capsule) "	4
4	"Plant annual "	Dorotheanthus
4	"Plants perennial "	5
5	"Plants with the leaves separated so that the stem nodes are clearly visible between the leaf pairs "	6
5	"Plants with the leaf pairs close together so that the nodes are not visible "	10
6	"Stigmas broadly triangular or ovate "	7
6	"Stigmas narrow and pointed, linear or threadlike "	9
7	"Plants without small blunt surface protuberances (papillae) "	Lampranthus
7	"Plants with papillae "	8
8	"Papillae forming small shiny globules on the leaf surface "	Drosanthemum
8	"Papillae not glistening "	Delosperma
9	"Leaves 3-angled, grey-blue with the margins often toothed; nectary glands 5, discrete "	Oscularia
9	"Leaves mostly green, generally with a lower toothed ridge; nectary glands in scalloped ring "	Ruschia
10	"Plants with a solitary pair of leaves on the flowering shoot "	11
10	"Plants with more than one pair of leaves on the flowering shoots "	13
11	"Leaves united for less than half their length and not forming a body, surface with distinctive dark green dots "	Pleiospilos
11	"Leaves united for at least half of their lengths to form a plant body "	12
12	"Sepals united into a tube at the base; leaves rarely coloured, wrinkled or windowed "	Conophytum
12	"Sepals free; plant body of 2 pebble-like leaves, often coloured, wrinkled or with a translucent window "	Lithops
13	"Leaves spoon-shaped, flattened "	Aloinopsis
13	"Leaves not as above "	14
14	"Leaf surface with conspicuous dark green dots "	Pleiospilos
14	"Leaf surface without conspicuous dark green dots "	15
15	"Leaves finger-like, roundish in section with translucent ‘windows’ at the tips "	Fenestraria
15	"Leaves not as above "	16
16	"Leaves with a cup-like dry, papery sheath "	Cheiridopsis
16	"Leaves not as above "	17
17	"Leaf pairs clearly different "	Glottiphyllum
17	"Leaf pairs similar, jaw-like, with backwardly pointed teeth on the margins "	Faucaria