100 



LABIATAE. 



VOL. HI. 



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 s-toothed, not 2-lipped; plant erect. 10. Nepeta. 



Calyx distinctly 2-lipped, or unequally s-toothed. 



Trailing herb; calyx unequally s-toothed. n. 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-io-toothed, not distinctly 2-lipped, open in fruit. 

 Calyx membranous, inflated in fruit, faintly nerved. 



Calyx nearly equally s-toothed, or s-lobed. 14. Dracocephalum. 



Calyx 4-lobed. 15. Synandra. 



Calyx not membranous, not inflated in fruit, distinctly s-io-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 s-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, is-nerved, equally s-toothed. 24. Monarda. 



Calyx ovoid-tubular, i3-nerved, 2-lipped. 25. Blephilia. 



ft 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 jo-nerved, campanulate, about equally 5-toothed. 28. Satureia. 



Calyx mostly i3-nerved, tubular, 2-lipped. 29. Clinopodium. 



Stamens straight, often diverging. 



Calyx is-nerved. 3- Hyssopus. 



Calyx io-i3-nerved. 



Anther-bearing stamens 4. 

 Anther-sacs divergent. 



Calyx equally s-toothed; erect herbs. 31- Origanum. 



Calyx 2-lipped ; creeping herbs. 3 2 - Thymus. 



Anther-sacs parallel. 33- Koellia. 



Anther-bearing stamens 2. 34- Cunila. 



Corolla regular, 4-s-lobed. 



Anther-bearing stamens 2 ; plants not aromatic. 35- Lycopus. 



\nther-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. 

 Anther-bearing stamens 4 ; lower lip of corolla not fimbriate ; introduced. 



Flowers racemose. 



Flowers densely spiked. 



37. Collinsonia. 



38. Per ilia. 



39. Elsholtzia. 



I. 



A JUG A L. Sp. PI. 561. 1^753. 

 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, lo-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- 



