1	"Plants annual herbs"	2
1	"Plants perennial herbs or subshrubs"	6
2	"Calyces radially symmetric or almost so, with equal, subulate lobes and an annular vein around the base of the limb"	"Leucas nubica"
2	"Calyces more or less bilaterally symmetric, with unequal lobes, without a distinct annular vein arouns the limb"	3
3	"Cymes with 15 or more flowers"	4
3	"Cymes with 3-11 flowers"	5
4	"Calyx tubes straight near their mounths, ventral sides longer than the dorsal and often with a greatly recurved ventral lip; uppermost calyx lobes less than twice as long as the longest of the other lobes"	"Leucas urticifolia"
4	"Calyx tubes strongly recurved near their mouths, ventral sides not longer than the dorsal sides; uppermost calyx lobes less than twice as long as the longest of the other lobes"	"Leucas martincensis"
5	"Corollas 5-10(-13) mm long; leaves sessile or very shortly petiolate, with sessile glands"	"Leucas neuflizeana"
5	"Corollas 10-15(-20) mm long; leaves more or less petionalte, without sessile glands"	"Leucas glabrata"
6	"Plants perennial herbs or subshrubs"	7
6	"Plants subshrubs"	8
7	"Most leaves entire or with up to 4 teeth; calyces strongly hairy in the mouth"	"Leucas cuneifolia"
7	"Most leaves with 5-10 teeth; calyces not strongly hairy in the mouth"	"Leucas glabrata"
8	"Leaf lengths more than 3 times their widths; margins entire or with up to 3 teeth per side"	9
8	"Leaf lengths less than 3 times their widths; margins entire or with up to 10 teeth per side"	10
9	"Calyx lobes acuminate, at least some over 1 mm long; calyx tubes slightly to strongly enlarged on the ventral side"	"Leucas abyssinica"
9	"Calyx lobes broadly triangular to obscure, less than 1 mm long; calyx tubes only slightly enlarged on the ventral side"	"Leucas jamesii"
10	"Nutlets truncate or subtruncate at the top; calyces 5-10-lobed, 5-9 mm long"	11
10	"Nutlets rounded to subtruncate at the top; calyces with 9-10 lobes, 7-12 mm long"	13
11	"Calyces 9-10-lobes, with a distinct, slightly recurved lip on the central side formed by the 3 ventral lobes; nutlets subtruncate at the top"	"Leucas somalensis"
11	"Calyces 5-10 lobed, slightly longers on the ventral side but without a distinct lip; nutlets sharply truncate at the top"	12
12	"Leaf lengths more than 1.6 times their widths, entire or with up to 2 teeth on each side; ventral side of calyx tubes enlarged not recurved although the teeth may be"	"Leuca abyssinica"
12	"Leaf lengths 1-2 times their widths, with 3-5 teeth on each side;  ventral side of calyx tubes enlarged and slightly recurved"	"Leucas discolor"
13	"Fruiting calyces shortly tubular to bulging; lobes 1-2 mm long, often directed towards each other; nutlets rounded at the top, covered with glands"	"Leucas inflata"
13	"Fruiting calyces obconic; lobes 1-6 mm long, straight or spreading; nutlets rounded or subtruncate at the top, glands present only at the top"	14
14	"Lower leaf-like bracts mostly as long as wide or slightly wider than long; corollas 9-14 mm long; lower style-branches over 3 times as long as the upper branchers"	"Leucas minimifolia"
14	"Lower leaf-like bracts longer than wide, cuneate at the base; corollas 12-20 mm long; lower style branches less than 3 times as long as the upper branches"	"Leucas cuneifolia"