1	"Fertile stamens 2, infertile stamens (staminodes) 2 and reduced or absent"	2
1	"Fertile stamens 4"	7
2	"Calyx 2-lipped"	3
2	"Calyx of 5 more or less equal teeth"	5
3	"Leaves evergreen,margins rolled under"	Rosmarinus
3	"Leaves deciduous,margins not rolled under"	4
4	"Upper lip of corolla entire or notched; fertile anther chambers mostly 1"	Salvia
4	"Upper lip of corolla with 4 lobes; fertile anther chambers 2"	Perovskia
5	"Leaves in opposite pairs; flowers in dense heads"	Monarda
5	"Leaves in whorls of 3–5; flowers solitary or raceme-like"	6
6	"Upper stamens with the connective elongated, the end swollen and bearded"	Hemigenia
6	"Upper stamens with the connective not or only shortly elongated, not swollen or bearded"	Westringia
7	"Leaves of 3 strongly aromatic lanceolate leaflets"	Cedronella
7	"Leaves not as above"	8
8	"Corolla more or less regular, 4-lobed, the upper lobe sometimes largest"	9
8	"Corolla 2-lipped, generally the upper lip of 2 lobes and lower of 3"	10
9	"Herbs with stamens of the same length"	Mentha
9	"Shrubby plants with 2 stamens longer than the other 2 and protruding"	Elsholtzia
10	"Trailing plant with roundish to kidney-shaped, often variegated leaves"	Glechoma
10	"Plant not as above"	11
11	"Leaves brightly multicoloured (formerly Coleus)"	Solenostemon
11	"Leaves not as above"	12
12	"Calyx 2-lipped and with a distinctive shield-like crest or fold"	Scutellaria
12	"Calyx without a crest, rarely 2-lipped, mostly with 3, 5 or 10 teeth"	13
13	"Flowers in false whorls crowded together in heads or spikes (sometimes branched)"	14
13	"Flowers axillary or in false whorls, forming well-spaced clusters in heads or spikes (sometimes branched)"	23
14	"Flower clusters usually branched; calyx split down 1 side, flared, bract-like"	Origanum
14	"Flowers in spike or raceme; calyx not split and bract-like"	15
15	"Calyx 2-lipped, the lips entire or lobed"	16
15	"Calyx of 5 more or less equal teeth"	18
16	"Calyces with large, entire, kidney-shaped bracts, closed when in fruit"	Prunella
16	"Calyces with small bracts, never kidney-shaped, open in fruit"	17
17	"Plants mostly 20 cm or more tall; calyx usually 15-nerved"	Agastache
17	"Plants prostrate or spreading and low-growing, less than 20 cm tall; calyx usually 10-nerved"	Thymus
18	"Plants woody, at least at the base"	19
18	"Plants herbaceous, not woody, even at the base"	20
19	"Calyces with 10 veins; corolla tube no longer than the calyx and with a ring of hairs inside"	Ballota
19	"Flower not as above"	Lavandula
20	"Upper lip of corolla minute or reduced to 3 small lobes; ovary shallowly 4-lobed"	Ajuga
20	"Upper lip of corolla developed, often larger than lower; ovary deeply 4-lobed"	21
21	"Calyx with mostly 15 nerves; 2 stamens closest to upper lip longer than lower 2"	Nepeta
21	"Calyx nerves 5–10, upper pair of stamens shorter than lower pair"	22
22	"Plant mostly 1m or more tall, more or less hairless; leaves toothed, often sharply so; calyx inflated in fruit"	Physostegia
22	"Plants mostly less than 50 cm tall, generally hairy; leaves entire or round-toothed; calyx not inflated in fruit"	Stachys
23	"Calyx about as long as the corolla, always longer than the flower tube"	24
23	"Calyx shorter than the corolla and often even shorter than the flower tube"	25
24	"Calyx expanded and with 5 small teeth, reticulately veined"	Moluccella
24	"Calyx not both expanded and reticulately veined"	Ocimum
25	"Calyx 2-lipped, the lips entire or with tooth-like lobes"	26
25	"Calyx with 3, 5 or 10 teeth that are more or less the same size"	34
26	"Calyx with the lower lip of 4 equal teeth, the upper lip of 1 large tooth"	Plectranthus
26	"Calyx not as above"	27
27	"Calyx 15-nerved"	Dracocephalum
27	"Calyx 5–13-nerved"	28
28	"Habit prostrate or low and spreading, mostly with small aromatic leaves"	Thymus
28	"Plants rarely low and spreading but, if similar to above, then stamens arching together"	29
29	"Leaves in a basal rosette; flowers in a leafless spike"	Horminum
29	"Leaves along the stem; flowers in a branched cluster"	30
30	"Leaves strongly lemon-scented; corolla tube weakly S-shaped"	Melissa
30	"Leaves strongly aromatic but not smelling of lemon; corolla tube more or less straight"	31
31	"Mostly shrubs or small trees; leaves mint-scented when crushed"	Prostanthera
31	"Mostly herbs; leaves not mint-scented"	32
32	"Leaves thyme-like"	Micromeria
32	"Leaves not thyme-like"	33
33	"Style branches distinctly unequal, the lowermost broadest"	Calamintha
33	"Style branches more or less equal"	Satureja
34	"Upper lip of corolla absent, lower lip with 4 minute lobes and 1 large one"	Teucrium
34	"Upper lip of corolla present, 2–3-lobed"	35
35	"Leaves deeply palmate, with 3–5 lobes"	Leonurus
35	"Leaves not as above"	36
36	"Woody shrubs with feathery flower clusters due to hairs on the calyx"	Bystropogon
36	"Mostly herbs, flowers not feathery"	37
37	"Style and stamens enclosed within the corolla tube"	Marrubium
37	"Style and stamens protruding from the corolla tube"	38
38	"Anthers sticking together and hard against the upper lip of the corolla"	Satureja
38	"Anthers not sticking together or close to the upper lip of the corolla"	39
39	"Stamens spreading, the anthers of each pair spreading outwards"	40
39	"Stamens parallel or only the lower pair spreading slightly"	41
40	"Shrub with lanceolate leaves; flowers blue or lilac"	Hyssopus
40	"Herb with ovate leaves; flowers purple or white"	Origanum
41	"Upper stamen pair longer than the lower pair"	Nepeta
41	"Upper stamen pair shorter than the lower pair"	42
42	"Verticil leaves (leaves with the flower clusters) shorter than the flowers"	Stachys
42	"Floral leaves with verticils mostly as large as stem leaves, conspicuous in the flower cluster and longer than the flowers"	43
43	"Floral bracts to half as long as the calyx tube; corolla not distinctly hairy outside"	Lamium
43	"Floral bracts about as long as the calyx tube; corolla distinctly hairy outside"	44
44	"Upper lip of corolla much longer than the lower lip; flowers orange or white"	Leonotis
44	"Upper lip of corolla not longer than the lower lip; flowers yellow, lilac or purple"	Phlomis