Vol. III.] 



MINT FAMILY. 



75 



Stamens longer, not included in the corolla-tube. 



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. 

 Trailing herb; stamens all ascending under upper lip of corolla. 

 Anther-sacs divergent. 



Calyx tubular, nearly equally 5-toothed, not 2-lipped; plant erect. 

 Calyx distinctly 2-lipped, or unequally 5-toothed. 

 Trailing herb; calyx unequally 5-toothed. 

 Erect herbs; calyx 2-lipped. 

 Posterior pair of stamens shorter than the anterior. 

 Calyx distinctly 2-lipped, closed in fruit. 

 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. 

 Calyx 4-lobed. 

 Calyx not membranous, not inflated in fruit, distinctly 5-10-nerved. 

 Style-branches very unequal. 

 Style-branches equal, or nearly so. 

 Anther-sacs transversely 2-valved. 



Anther-sacs not transversely 2-valved, parallel or divergent. 

 Nutlets 3-sided, truncate. 



Calyx-teeth not spiny-tipped. 

 Calyx-teeth spiny-tipped. 

 Nutlets ovoid, rounded above. 



Calyx with a spreading 5-toothed limb. 

 Calyx-limb not spreading. 



Corolla-tube not longer than the calyx; anther-sacs divergent. 



20. St achy s. 

 Corolla-tube exserted; lower petioles very long; anther-sacs parallel. 



21. Betonica. 



19. Ballota. 



Connective of the anther very 



none, at the other. 

 Connective very short, the anther-sacs confluent. 



Calyx tubular, 15-nerved, equally 5-toothed. 



Calyx ovoid-tubular, 13-nerved, 2-lipped. 



(b. ) Anther-bearing stamens 2. 

 long, bearing a perfect sac at one end, and 



rudimentary one, or 

 22. Salvia. 



23- 



24. 



Monarda. 

 Blephilia. 



f f 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 

 Anther-bearing stamens 2. 

 Anther-bearing stamens 4. 



Corolla-tube upwardly curved, exserted. 

 Corolla-tube straight. 



Calyx 10-nerved, campanulate, about equally 5-toothed. 

 Calyx mostly 13-nerved, tubular, 2-lipped. 

 Stamens straight, often diverging. 

 Calyx 15-nerved. 

 Calyx 10-13-nerved. 



Anther-bearing stamens 4. 

 Anther-sacs divergent. 



Calyx equally 5-toothed; erect herbs. 

 Calyx 2-lipped; creeping herbs. 

 Anther-sacs parallel. 

 Anther-bearing stamens 2. 

 Corolla regular, 4-5-lobed. 



Anther-bearing stamens 2; plants not aromatic. 

 Anther-bearing stamens 4; aromatic fragrant herbs. 



the corolla. 



25. Hedeoma. 



26. Melissa. 



27. Satureia. 



28. Clinopodium. 



29. Hyssopus. 



30. Origanum. 



32. Thymus. 



31. Koellia. 



33. Cunila. 



34. Lycopus. 



35. Mentha. 



(b.) Flowers in terminal panicled racemes or spikes; corolla 2-lipped. 



Anther-bearing stamens 2; lower lip of corolla long, fimbriate; native. 36. Collinsonia. 

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



Flowers racemose. 37. Perilla. 



Flowers densely spiked. 38. Elshollzia. 



i. AJUGA L. Sp. PI. 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-n,erved, 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 lpbes 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- 



