LABIA TAE. 78 1 



connective very short, the anther-sacs confluent. 



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



Calyx ovoid-tubular, 13-nerved, 2-lipped. 24. Blephilia. 



1 1 Corolla 2,-lipped, or regular; upper lip, ii'/ien 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. Iledeoma. 



Anther-bearing stamens 4. 



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



Corolla-tube straight. 



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



27. Satureia. 

 Calyx mostly 13 nerved, tubular, 2-lipped. 28. Clinopodium. 



Stamens straight, often diverging. 



Calyx 15-nerved. 29. Hyssopus. 



Calyx 10-13-nerved. 



Anther-bearing stamens 4. 

 Anther-sacs divergent. 



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



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



Anther-sacs parallel. 31. Koellia. 



Anther-bearing stamens 2. 33. 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. Perilla. 



Flowers densely spiked. 38. Elsholtzia. 



1. AJUGA L. (See Appendix.) 

 Herbs, mostly with dentate leaves, and rather large verticillate-clustered flowers 

 in terminal spikes, or in the upper axils. Calyx 10 -many-nerved, 5-toothed or 

 5-lobed, the teeth or lobes nearly equal. Corolla-limb 2-lipped, the upper lip short, 

 the lower spreading, with 2 small lateral lobes and a much larger emarginate or 

 2 -cleft middle one. Stamens 4, didynamous, the anterior pair the longer; anther- 

 sacs divergent, only slightly confluent at the base. Nutlets obovoid, rugose-reticu- 

 late. [Greek, without a yoke; from the seeming absence of the upper lip of the 

 corolla.] About 40 species, natives of the Old World. 



1. Ajuga reptans L. Bugle. (I. F. f. 3069.) Perennial, producing slender 

 stolons; stem erect, 1.5-4 dm. tall. Basal leaves tufted, obovate, rounded at the 

 apex, crenate or undulate, 2-8 cm. long, tapering into margined petioles; leaves 

 of the stem oblong or oblanceolate. smaller, sessile or nearly so, those of the stolons 

 mostly petioled; upper flower-clusters, often forming a short spike, the lower com- 

 monly distant and axillary; corolla blue or nearly white, about 12 mm. long. In 

 fields, Quebec and Me. to southern N. Y. Nat. from Europe. May-June. 



2. TEUCRIUM L. (See Appendix.) 



Herbs or shrubs, with rather small pink white or purplish flowers, in terminal 

 bracted spikes or heads, or verticillate in the upper axils. Calyx tubular-campanu- 

 late, 10-nerved, 5-toothed. Corolla-tube short, the limb irregularly 5-lobed, the 

 2 short upper lobes oblong, the lateral lobe declined, more or less united with the 

 upper ones, the lower lobe broader, also declined. Stamens 4, didynamous. the 

 anterior pair the longer; anther-sacs divergent, confluent at the base. Nutlets 

 obovoid, rugose-reticulated. [Named from the Trojan king, Teucer.] Over 100 

 species, of wide distribution. Besides the following, 3 others occur in the southern 

 U. S. 



Leaves dentate or serrate ; flowers in terminal spikes. 



Calyx canescent, it upper teeth obtuse. 1. 7". Canadense. 



Calyx villous, its upper teeth acutish. 2. T. occidentals 



Leaves pinnately parted; flowers axillary, solitary. 3. T. laciniatum. 



