1018 LAMIACEAE 
Calyx-tube 10-ribbed. 29. PYCNOTHYMUS. 
Calyx-tube 13-ribbed. 30. MICROMERIA. 
Calyx 2-lipped. 
Anther-sacs awnless. 31. CLINOPODIUM. 
Anther-sacs awned. 32. DICERANDRA. 
++ Filaments straight, often spreading. 
Calyx-tube 15-nerved. 33. HyssoPvs. 
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. Š 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 
Stems downy-canescent : leaf-blades narrowed at the base. DE 
Calyx prominently ribbed at maturity : corolla glandular-puberulent. QT Nashit. 
Calyx not ribbed at maturity: corolla pilose. : 3. T. littorale. i 
Stems villous-hirsute, with relatively long spreading or recurved-spreading hairs. 4. T. occidentale. 
. T. Canadense. 
1. Teucrium Canadénse 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 Náshii 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 slightly acuminate, quite evenly serrate, narrowed at the more or less inequilateral beer 
short-petioled : panicle somewhat interrupted below, at least in age: bract as long ast : 
mature calyx or longer: calyx closely pubescent, ribbed at maturity ; lobes erect, the uppe 
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 littoràle Bicknell. Stems 3-5 dm. tall, often sparingly branched, pus 
and closely canescent: leaf-blades relatively thick, oblong, usually narrowly so, to yn 
rowly oblong-lanceolate, 6-11 cm. long, acute or blunt-pointed, finely serrate or pa ^pa 
dentate-serrate, rugose, softly appressed-pubescent above, pale or whitish tomentu o 
neath : panicle narrow, often interrupted : bract about as long as the mature calyx, Le 
nate : calyx downy, 4-5 mm. long, not ribbed ; tube becoming somewhat Ts i = 
erect, the upper obtuse, the lower acute or acuminate: corolla pale pink, about : 
long, loosely pilose. 
On or near the coast, Maine to Florida. Summer. 
4. Teucrium occidentale A. Gray. Stem 3-8 dm. tall, villous-hirsute ve peus 
ing or recurved hairs, with few or several erect branches : leaf-blades ovate-oblong, 
