532 Menthaceae 
DD. Stem not villous nor tomentose tho often hairy. 
G. Calyx with a crest or protuberance on one side. SCUTELLARIA (p. 333) 
GG. Calyx without crest or protuberance. 
H. Calyx 15-veined. 
I. Leaves not entire; leaf-blades widest at or below their middle. 
J. Plants not aromatic; flowers in elongated spike-like clusters; all 
4 stamens with anthers. 
K. Perennial; leaves triangular-ovate; inflorescence-bracts not 
pectinate; lower lip of corolla with middle lobe crenulate. 
_ AGASTACHE (p. 334) 
KK. Annual or biennial; leaves lanceolate; inflorescence-bracts 
pectinate; lower lip of corolla with middle lobe not crenulate. 
DRACOCEPHALUM (p. 334) 
JJ. Plants aromatic; flowers in flattened or round head-like clusters; 
2 stamens with anthers, 2 others from antherless to totally absent. 
Monarpa (p. 336) 
II. Leaves entire, oblanceolate to obovate. PoGOoGYNE (p. 337) 
HH. Calyx 5—13-veined. 
L. Leaves not cleft. 
M. Flowers in terminal head-like or dense spike-like clusters; calyx 
1 0—1 3-veined. 
N. Heads elongated, spike-like. PRUNELLA (p. 335) | 
NN. Heads flat. MADRONELLA (p. 337) 
_ MM. — Flowers in loose interrupted terminal spike-like clusters; calyx 
5—10-veined. 
O.  Leaf-teeth sharp-pointed, not rounded; leaves narrowed at 
base. PHYSOSTEGIA (p. 335) 
OO. Leaf-teeth somewhat rounded at tip; leaves rounded to cor- 
date at base. STACHYsS (p. 336) 
MMM. Flowers in whorls in the axils of ordinary stem-leaves; 
calyx about 5- or | 3-veined. 
P. Annual or biennial; upper leaves sessile: flowers purple or 
red; calyx about 5-veined. LaMIUM (p. 335) 
PP. Perennial; upper leaves petioled; flowers white or yellow; 
calyx about | 3-veined. MELIssA (p. 337) 
LL. Leaves 3-cleft or some 5-cleft; flowers in the axils of ordinary 
leaves. LEONURUs (p. 335) 
CC. Corolla regular or nearly so. 
Q. Annual; leaves entire or merely slightly wavy; ovary deeply 4-lobed. 
TRICHOSTEMA (p. 333) 
QQ. Perennial; leaves toothed; ovary 4-parted. 
R. Plants without mint odor; 2 stamens with anthers and 2 antherless. 
Lycopus (p. 337) 
RR. Plants with mint odor; all 4 stamens with anthers. MENTHA (p. 338) 
8B. Plants prostrate, vine-like. 
S. Plant with disagreeable odor; petioles 25 mm. or more long; leaves dark- 
green; flowers in small clusters in the leaf-axils. GLECOMA (p. 334) 
SS. Plant with mint odor; petioles 4-6 mm. long; leaves red-green; flowers 
solitary in the leaf-axils. MicrRoMERIA (p. 338) 
AA. Shrubs, aromatic; leaves entire, spatulate to obovate. RAMONA (p. 336) 
~—e 
