Vol. hi.] 



MINT FAMILY. 



75 



Stamtiis longer, not included in the corolla-tube. 



t Corolla strongly 2-lipped ; lifs unlike, llie nfipcr 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. 7. Agastache. 



Trailing herb; stamens all ascending under upper lip of corolla. 8. Meehania. 



Anther-sacs divergent. 



Calyx tubular, nearly equally s-toothed, not 2-lipped; plant erect. 9. Nepela. 



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



Trailing herb; calyx unequally 5-toothed. 10. 



Erect herbs; calyx 2-lipped. II. 



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. 19. Ballota. 



Calyx-limb not spreading. 



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



20. Stacliys. 

 Corolla-tube exserted; lower petioles very long 



Glecoma. 

 Dracocephalti ni, 



12. Prunella. 



13. Pliysostegia. 



14. Synandra. 



15- 

 16. 



18. 

 17- 



Phlomis. 



Galeopsis. 



Lamium. 

 Leonurus. 



anther-sacs parallel. 

 21. Belonica. 



( 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. 22. Salvia. 

 Connective very short, the anther-sacs confluent. 



Calyx tubular, 15-nerved, equally 5-toothed. 23. Hfonarda. 



Calyx ovoid-tubular, i3-ner\ed, 2-lipped. 24. Blephilia. 



t t 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. 25. Hedeonia. 

 Anther-bearing stamens 4. 



Corolla-tube upwardly curved, exserted. 26. Melissa. 

 Corolla-tube straight. 



Calyx 10 ner\-ed, campanulate, about equally 5-toothed. 27. Satureia. 



Calyx mostly i3-nen.-ed, tubular, 2-lipped. 28. Clinopodium. 

 Stamens straight, often diverging. 



Calyx 15-nerved. 29. Hyssopus. 

 Calyx io-13-nerved. 



Anther-bearing stamens 4. 

 Anther-sacs divergent. 



Calyx equally 5-tootlied; erect herbs. 30. Origanum. 



Calyx 2-lipped; creeping herbs. 32. Thymus. 



Anther-sacs parallel. 31. Koellia. 



Anther-bearing stamens 2. ^t^. Cunila. 

 Corolla regular, 4-5-lobed. 



Anther-bearing stamens 2; plants not aromatic. 34. Lycopus. 



Anther-bearing stamens 4; aromatic fragrant herbs. 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. Pcrilla. 



Flowers densely spiked. 3S. Elslwllzia. 



I. AJUGA L. Sp. PI. 561. 1753. 



Annual or perennial, often stolouiferous 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 eniarginatc, 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 auterior pair the longer; anther- 



