100 LABIATAE. Vor. ITT. 
t Corolla strongly 2-lipped ; lips unlike, the upper concave. 
(a.) Anther-bearing stamens 4. 
Posterior (upper) pair of stamens longer than the anterior. 
Anther-sacs parallel or nearly so. 
Tall erect herbs; posterior stamens declined, anterior ascending. - 8. Agastache. 
Trailing herb; stamens all ascending under upper lip of corolla. 9. Meehania. 
Anther-sacs divergent. 
Calyx tubular, nearly equally 5-toothed, not 2-lipped; plant erect. 10. Nepeta. 
Calyx distinctly 2-lipped, or unequally 5-toothed. 
Trailing herb; calyx unequally 5-toothed. 11. Glecoma. 
Erect herbs; calyx 2-lipped. 12. Moldavica. 
Posterior pair of stamens shorter than the anterior. 
Calyx distinctly 2-lipped, closed in fruit. 13. Prunella. 
Calyx 3-10-toothed, not distinctly 2-lipped, open in fruit. 
Calyx membranous, inflated in fruit, faintly nerved. 
Calyx nearly equally 5-toothed, or 5-lobed. 14. Dracocephalum. 
Calyx 4-lobed. 15. Synandra. 
Calyx not membranous, not inflated in fruit, distinctly 5-10-nerved. 
Style-branches very unequal. : 16. Phlomis. 
Style-branches equal, or nearly so. 
Anther-sacs transversely 2-valved. 17. Galeopsis. 
Anther-sacs not transversely 2-valved, parallel or divergent. 
Nutlets 3-sided, truncate. 
Calyx-teeth not spiny-tipped. 18. Lamium. 
Calyx-teeth spiny-tipped. 19. Leonurus. 
Nutlets ovoid, rounded above. 
Calyx with a spreading 5-toothed limb. 20. Ballota. 
Calyx-limb not spreading. 
Corolla-tube not longer than calyx; anther-sacs divergent. 
21. Stachys. 
Corolla-tube exserted; lower petioles very long; anther-sacs parallel. 
22. Betonica. 
(b.) Anther-bearing stamens 2. 
Connective of the anther very long, bearing a perfect sac at one end, and a rudimentary one, or 
none, at the other. 23. Salvia, 
Connective very short, the anther-sacs confluent. 
Calyx tubular, 15-nerved, equally 5-toothed. 24. Monarda. 
Calyx ovoid-tubular, 13-nerved, 2-lipped. _ 25. Blephilia. 
tt Corolla 2-lipped, or regular; upper lip, when present, flat, or only slightly concave. 
(a.) Flowers in axillary whorls or clusters, or these forming terminal spikes. 
Corolla 2-lipped. 
Stamens curved, often converging, or ascending under the upper lip of the corolla. 
Anther-bearing stamens 2. 26. Hedeoma. 
Anther-bearing stamens 4. 
Corolla-tube upwardly curved, exserted. 27. Melissa. 
Corolla-tube straight. 
Calyx 10-nerved, campanulate, about equally 5-toothed. 28. Satureia. 
Calyx mostly 13-nerved, tubular, 2-lipped. 29. Clinopodium. 
Stamens straight, often diverging. 
Calyx 15-nerved. 30. Hyssopus. 
Calyx 10-13-nerved. 
Anther-bearing stamens 4. 
Anther-sacs divergent. 
Calyx equally 5-toothed; erect herbs. 31. Origanum. 
Calyx 2-lipped ; creeping herbs. 32. Thymus. 
Anther-sacs parallel. 33. Koellia. 
Anther-bearing stamens 2. 34. Cunila. 
Corolla regular, 4-5-lobed. 
Anther-bearing stamens 2; plants not aromatic. 38. Lycopus. 
Anther-bearing stamens 4; aromatic fragrant herbs. 36. Mentha. 
(b.) Flowers in terminal panicled racemes or spikes; corolla 2-lipped. 
Anther-bearing stamens 2; lower lip of corolla long, fimbriate; native. 37. Collinsonia. 
Anther-bearing stamens 4; lower lip of corolla not fimbriate ; introduced. 
Flowers racemose. 38. Perilla. 
Flowers densely spiked. 39. Elsholtzia. 
1. AJUGA L. Sp. Pl. 561. 1753. 
Annual or perennial, often stoloniferous herbs, mostly with dentate leaves, and rather 
large verticillate-clustered flowers in terminal spikes, or in the upper axils. Calyx ovoid or 
campanulate, Io-many-nerved, 5-toothed or 5-lobed, the teeth or lobes nearly equal. Corolla- 
limb 2-lipped, the upper lip short, truncate or emarginate, the lower spreading, with 2 small 
lateral lobes and a much larger emarginate or 2-cleft middle one. Stamens 4, didynamous, 
somewhat exserted beyond the upper lip of the corolla, the anterior pair the longer; anther- 
