high; flowers blue, in summer) =Mad-dog Skullcap, Scutellaria lateriflora.=

16b. Corolla 6-10 mm. long; flowers axillary, solitary (1-3 dm.

high; flowers violet, early summer) =Skullcap, Scutellaria parvula.=

16c. Corolla 12-30 mm. long; flowers axillary or in terminal racemes (4-8 dm. high; flowers blue, summer) --17.

17a. Stem-leaves cordate =Skullcap, Scutellaria versicolor.=

17b. Stem-leaves not distinctly cordate --18.

18a. Stem-leaves sessile or nearly so; plant of swamps and river-banks =Skullcap, Scutellaria galericulata.=

18b. Stem-leaves with petioles 1 cm. or more long; plants of dry or moist woods --19.

19a. Stem glandular-p.u.b.escent toward the summit; corolla 16 mm. long or less =Skullcap, Scutellaria pilosa.=

19b. Stem not glandular; corolla 20 mm. long =Skullcap, Scutellaria incana.=

20a. Calyx-teeth 5, all equal or nearly so at the time of flowering --28.

20b. Calyx-teeth 5, one of them different in size and shape from the other four (2-6 dm. high; flowers light blue, summer) =Dragon Head, Dracocephalum parviflorum.=

20c. Calyx-teeth 5, two of them different in size and shape from the other three --21.

20d. Calyx-teeth 10, subulate (woolly plant 4-10 dm. high, with whitish flowers in axillary cl.u.s.ters in summer) =h.o.a.rhound, Marrubium vulgare.=

21a. Corolla deeply split on the upper side and the stamens protruding; upper lip of the calyx much shorter than the lower (5-10 dm. high; flowers pink-purple, in terminal spikes, summer) (Wood Sage) --22.

21b. Corolla not deeply split on the upper side --23.

22a. Calyx canescent =Wood Sage, Teucrium canadense.=

22b. Calyx villous =Wood Sage, Teucrium occidentale.=

23a. Flowers in dense terminal head-like spikes, none axillary (1-5 dm.

high; flowers pink-purple or blue, in summer) =Self-heal, Prunella vulgaris.=

23b. Some or all of the flowers in axillary cl.u.s.ters --24.

24a. Leaves linear, entire (1-4 dm. high; flowers purple, summer) --25.

24b. Leaves oblong to ovate (summer) --26.

25a. Pedicels shorter than the calyx =Summer Savory, Satureja hortensis.=

25b. Pedicels much longer than the calyx =Calamint, Satureja glabra.=

26a. Leaves 1 cm. long or less, entire (stems growing in mats, 1-3 dm. long; flowers purple, in summer) =Wild Thyme, Thymus serpyllum.=

26b. Leaves dentate (flowers purple, summer) --27.

27a. Flowers subtended by bracts as long as the calyx (2-5 dm. high) =Basil, Satureja vulgaris.=

27b. Flowers with minute bracts or none (1-3 dm. high) =Basil-thyme, Satureja acinos.=

28a. Corolla 2-lipped or nearly regular, the upper lip flattened, not conspicuously arched over the stamens --29.

28b. Corolla conspicuously 2-lipped, the stamens ascending under the concave upper lip --42.

29a. Flowers in dense terminal spikes; corolla 2-lipped (8-15 dm. high; summer) --30.

29b. Flowers peduncled, 1-4 in the axils of linear leaves --25b.

29c. Flowers in many-flowered whorls, which are axillary or terminal, or aggregated into terminal spikes or racemes --31.

30a. Corolla yellowish =Giant Hyssop, Agastache nepetoides.=

30b. Corolla purplish =Giant Hyssop, Agastache scrophulariaefolius.=

31a. Corolla distinctly irregular, the lower lip longer than the upper --32.

31b. Corolla almost regular, the lobes nearly uniform in size --35.

32a. Stem-leaves sessile or very nearly so (flowers blue) --33.

32b. Stem-leaves long-petioled --34.

33a. Leaves linear-oblong, acute at both ends (3-8 dm. high; summer) =Hyssop, Hyssopus officinalis.=

33b. Leaves oblong to ovate, rounded at the ends (2-4 dm. high; late spring) =Bugle, Ajuga reptans.=

34a. Leaves ovate to oblong, acute; flowers pink, white, or pale purple (6-15 dm. high; summer) =Catnip, Nepeta cataria.=

34b. Leaves nearly circular or kidney-shape; flowers blue (creeping; flowers in spring and summer) =Ground Ivy, Nepeta hederacea.=

35a. Flowers in terminal spikes, or the lower axillary (3-8 dm. high; flowers pink-purple or white, summer) (Mint) --36.

35b. Flowers all in axillary whorls (flowers pink-purple or white, summer) (Mint) --38.

35c. Flowers in terminal capitate corymbed cl.u.s.ters (4-8 dm. high; flowers white or dotted with purple, summer) (Mountain Mint) --41.

36a. Leaves sessile or with very short petiole =Spearmint, Mentha spicata.=

36b. Leaves with manifest petioles --37.

37a. Princ.i.p.al leaves less than half as broad as long =Peppermint, Mentha piperita.=

37b. Princ.i.p.al leaves more than half as broad as long =Bergamot Mint, Mentha citrata.=