246 LAMIACEAE. 



Corolla-tube straight. 



Calyx with 5 nearly equal 



lobes, not 2-lipped. 19. SATUREIA. 



Calyx 2-lipped. 20. CLINOPODIUM. 



Filaments straight, often spreading. 

 Anther-bearing stamens 4. 

 Anther-sacs divergent. 



Calyx equally 5-lobed : erect 



herbs. 21. ORIGANUM. 



Calyx 2-lipped : creeping herbs. 22. THYMUS. 

 Anther-sacs parallel. 23. KOELLIA. 



Anther-bearing stamens 2. 24. CDNILA. 



Corolla regular with 4-5 lobes. 



Anther-bearing stamens 2 : foliage not 



aromatic. 25. LYCOPUS. 



Anther-bearing stamens 4 : foliage aro- 

 matic. 26. MENTHA. 

 Flowers in loose terminal panicles. 



Stamens 2 : lower lip of corolla fringed : 



native species. 27. COLLINSOXIA. 



Stamens 4 : lower lip of corolla not fringed : 



naturalized species. 28. PERILLA. 



1. TEUCTHUM [Tourn.] L. Perennial strict herbs. Leaf-blades toothed. 

 Flowers in raceme-like panicles. Calyx 2-lipped. Corolla mainly pink, very 

 irregular: upper lip minute, split: lower lip 3-lobed, projecting beyond the 

 upper one: tube relatively long. Stamens lying against the upper side of the 

 corolla. 



1. T. canadense L. Stem 2-12 dm. tall: leaf -blades relatively thin, ovate to 

 oblong-ovate, 6-14 cm. long, pubescent beneath: calyx becoming 6-8 mm. 

 long; lower lobes acuminate: corolla purplish or pink, 15-20 mm. long: nutlets 

 about 2.5 mm. long, wrinkled. Common, in fields and waste places, and on 

 roadsides. Sum. WOOD-SAGE. GERMANDER. 



2. ISANTHUS Michx. Annual herbs. Leaf -blades entire or sparingly 

 toothed. Flowers in axillary cymes. Calyx nearly regular. Corolla nearly 

 regular, the lobes spreading. Stamens slightly ascending. 



1. I. brachiatus (L.) B.S.P. Plants 1-4 dm. tall, viscid-pubescent: leaf- 

 blades elliptic to linear-elliptic, 1-4 cm. long: calyx becoming 5-6 mm. long; 

 lobes lanceolate to triangular-lanceolate: corolla blue; lobes mainly ovate: 

 nutlets 2-2.5 mm. long. Susquehanna valley. Frequent, on low islands and 

 shores. Schists. Sum. FALSE-PENNYROYAL. 



3. TRICHOSTEMA L. Annual or perennial herbs or shrubby plants. 

 Leaf -blades entire or repand. Flowers in axillary cymes. Calyx very irregular, 

 2-lipped. Corolla somewhat 2-lipped, the upper lip longer and narrower than 

 the lower lip. Stamens lying against the lower corolla-lip. 



1. T. dichotonram L. Plants 1-20 dm. tall: leaf -blades oblong to oblong-lanceo- 

 late, 2-7 cm. long: calyx becoming 5-6 mm. long; lobes acuminate: corolla 

 blue to white, about 5 mm. long: nutlets 1.5-2 mm. long. Common, in dry 

 fields. Sum. BASTARD-PENNYROYAL. BLUE-CURLS. 



4. SCUTELLABIA L. Annual or perennial herbs or shrubby plants. 

 Leaf -blades entire or toothed. Flowers axillary or in racemes. Calyx 2-lipped, 

 the upper lip crested. Corolla blue, violet, pink, or white, with a long curved 

 tube, 2-lipped, the upper lip arching. SKULLCAP. 



Nutlets wingless : fruit very slightly elevated on the small gynobase. 



Corolla less than 1 cm. long : flowers in secund elongating lateral racemes. 



1. 8. lateriflora. 



Corolla over 1 cm. long : flowers not in secund elongating 

 racemes. 



