20d. Calyx-teeth 10, subulate (woolly plant 4-10 dm. high, with whitish flowers in axillary clusters in summer) =Hoarhound, 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 clusters --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.=