1018 LAMIACEAE 



Calyx-tube 10-ribbed. 29. PYCNOTHYMUS 



Calyx-tube 13-ribbed. 30. MICKOMERIA. 



Calyx 2-lipped. 



Anther-sacs awnless. 31. CLINOPODIUM. 



Anther-sacs awned. 32. DICERANDRA. 



ft Filaments straight, often spreading. 



Calyx-tube 15-nerved. 33. HYSSOPUS. 



Calyx-tube 10-13-nerved. 

 Anther-bearing stamens 4. 



Anther-sacs divergent. 34. THYMUS. 



Anther sacs parallel. 35. KOELLIA. 



Anther- bearing stamens 2. 36. CUNILA. 



** Corolla nearly regular, with 4-5 lobes. 



Anther-bearing stamens 2 : foliage barely aromatic. 37. LYCOPUS. 



Anther-bearing stamens 4 : foliage strongly aromatic. 38. MENTHA. 



b. Flowers in loose terminal panicles. 



Lower lip of the corolla fringed : native genera. 



Anther-bearing stamens 4. 39. MICHELIELLA 



Anther-bearing stamens 2. 40. COLLINSONIA. 



Lower lip of the corolla not fringed : naturalized genus. 41. PERILLA. 



B. Stamens 4, didynamous ; lower pair longer, lying on the lower lip 



of the corolla. 

 CalyX with nearly equal lobes : corolla with a saccate 'drooping 



lower lip. 42. MESOSPHAERUM. 



Calyx with a broad decurrent upper lobe : corolla-lobes nearly 



equal. 43. OCIMUM. 



1. TEUCRIUM L. 



Perennial herbs or shrubby plants, with usually pubescent foliage. Leaves opposite : 

 blades merely toothed. Flowers in raceme-like panicles. Calyx campanulate or tubular- 

 campanulate : tube 10-ribbed : lobes 5, unequal. Corolla white, pink or purplish, very- 

 irregular : upper lip short : lower lip with 2 short lateral lobes and an elongated declined 

 middle lobe. Stamens 4, exserted between the lobes of the upper lip of the corolla, the 

 anterior pair the longer : anthers with divergent sacs confluent at the base. Nutlets vari- 

 ously marked. 



Stems hoary-canescent. 



Stems closely canescent : leaf-blades rounded at the base. 1. T. Canadensc* 

 Stems downy-canescent : leaf-blades narrowed at the base. 



Calyx prominently ribbed at maturity : corolla glandular-puberulent. 2. T. Nashii. 



Calyx not ribbed at maturity : corolla pilose. 3. T. littorale. 



Stems villous-hirsute, with relatively long spreading or recurved-spreading hairs. 4. T. occidentale* 



1. Teucrium Canadense L. Stems 2-12 dm. tall, closely canescent, simple, at least 

 below the inflorescence : leaf-blades relatively thin, ovate to oblong-ovate, 6-14 cm. long, 

 acute or acuminate, closely dentate-serrate, rounded or rarely subcordate at the base, green 

 and glabrate or thinly appressed hispidulous above, pale-pubescent beneath : panicle dense : 

 bract mostly shorter than the mature calyx : calyx canescent, often purplish, 5-7 mm. 

 long ; tube turbinate ; lobes various, the upper acute or obtuse, the lower pair slightly 

 longer, triangular-subulate : corolla pink, 15-20 mm. long, minutely granular-puberulent. 



In low grounds and on river banks, New England to Nebraska, Georgia and Texas. Summer. 



2. Teucrium Nashii Kearney. Stems 4-14 dm. tall, simple or sparingly branched 

 above, closely canescent : leaf -blades narrowly oblong to lanceolate, 4-13 cm. long, acute 

 or ulightly acuminate, quite evenly serrate, narrowed at the more or less inequilateral base, 

 short-petioled : panicle somewhat interrupted below, at least in age : bract as long as the 

 mature calyx or longer : calyx closely pubescent, ribbed at maturity ; lobes erect, the upper 

 obtuse, the lower ones acute : corolla pink, about 1.5 cm. long, granular-puberulent. 



In hammocks, thickets and on brackish shores, Florida to Mississippi. Spring and summer. 



3. Teucrium littorale Bicknell. Stems 3-5 dm. tall, often sparingly branched, pale 

 and closely canescent : leaf-blades relatively thick, oblong, usually narrowly so, to nar- 

 rowly oblong-lanceolate, 6-11 cm. long, acute or blunt-pointed, finely serrate or becoming 

 dentate-serrate, rugose, softly appressed-pubescent above, pale or whitish tomentulose be- 

 neath : panicle narrow, often interrupted : bract about as long as the mature calyx, acumi- 

 nate : calyx downy, 4-5 mm. long, not ribbed ; tube becoming somewhat urceolate ; lobes 

 erect, the upper obtuse, the lower acute or acuminate : corolla pale pink, about 15 mm. 

 long, loosely pilose. 



On or near the coast, Maine to Florida. Summer. 



4. Teucrium occidentale A. Gray. Stem 3-8 dm. tall, villous-hirsute with spread- 

 ing or recurved hairs, with few or several erect branches : leaf-blades ovate-oblong, oblong 



