1	"Plants scandent, leaves in a lax rosette"	"Aloe ciliaris"
1	"Plants stemless or if arborescent then free-standing, leaves in a dense rosette"	2
2	"Plants arborescent with a solitary stem"	3
2	"Plants generally stemless, suckering to form dense clumps"	5
3	"Leaves greater than 18 cm wide; inflorescence with 20–30 branches"	"Aloe marlothii"
3	"Leaves less than 18 cm wide; inflorescence with 1–8 branches"	4
4	"Leaves 6.5–12 cm wide; inflorescence with 1–4 branches"	"Aloe africana"
4	"Leaves 12–15 cm wide; inflorescence with 5–12 branches"	"Aloe ferox"
5	"Plants decumbent and sprawling"	6
5	"Plants suckering to form dense clumps"	7
6	"Leaves dark green with white spots"	"Aloe distans"
6	"Leaves waxy blue-green, unspotted"	"Aloe mitriformis"
7	"Leaves 3-ranked"	"Aloe variegata"
7	"Leaves in radial rosette"	8
8	"Plants with well developed aerial stems"	"Aloe arborescens"
8	"Plants stemless or with stems no more than 20 cm long"	9
9	"Leaves less than 10 cm long and 2 cm wide"	10
9	"Leaves greater than 10 cm long and 2 cm wide"	11
10	"Leaves waxy blue-grey, unspotted"	"Aloe humilis"
10	"Leaves green with white spots"	"Aloe aristata"
11	"Leaf margins with firm teeth 1.5–2 mm long"	"Aloe vera"
11	"Leaf margins with sharp teeth 3–5 mm long"	12
12	"Individual flower stalks 35–45 mm long"	"Aloe maculata"
12	"Individual flower stalks 8–10 mm long"	"Aloe parvibracteata"