524 LABIATAE 
gins. Otherwise resembles No. 5. Roadsides and waste places. July- 
Oct. 
7. M. aquatica, L. (Fig. 10, pl. 130.) Water Mint. Plant dewny, 
rarely smooth; stem usually branched, 13 to 23 ft. high. Leaves broadly 
egg-shaped; flowers in terminal, interrupted whorls, on short flower stems 
and often with one or more clusters in the upper axils; hairs of the stem 
point downward. Wet places, ditches, ete. Aug.-Oct. 
8. M.crispa, L. (Fig. 5, pl. 130.) Curtep Mint. Plant smooth or 
nearly so, stem 14 to 3 ft. high; leaves, at least the lower, on short leaf- 
stalks deeply incised, wavy, or the upper simply deeply toothed. Flowers 
in terminal more or less interrupted spikes. Swamps and ditches, southern 
part of our area. Aug.-Oct. 
9. M. arvensis, L. (Fig. 4, pl. 130.) Corn Mint. Plant generally 
hairy; stem branching or simple, 4 to 2 ft. high; leaves oblong lance- 
shaped, the marginal teeth rounded. Flowers all in axillary whorls; 
calyx downy, the teeth triangular. Stamens extending beyond the co- 
rolla. Dry places in most of our range. July-Sept. 
10. M. gentilis, L. (Fig. 8, pl. 130.) CREEPING WuHoRLED MINT. 
Plant more or less decumbent, branched, soft downy, 1 to 2 ft. high; 
leaves oval on short leaf-stems; flowers in axillary whorls, on short flower 
stems, the marginal teeth sharp. Calyx hairy only at the upper border, 
between or on the calyx teeth. Waste places, many localities in our 
range. 
11. M. cardiaca, Gerarde. (Fig. 11, pl. 130.) Marsa WHorLED 
Mint. (MM. sativa, L.?) More hairy than No. 10, and calyx is covered 
through its whole extent with hairs. Waste places. Escaped from culti- 
vation. Aug.-Sept. 
12. M. canadensis, L. (Fig. 6, pl. 130.) American Witp MInv. 
Stem more or less downy, 3 to 24 ft. high. Leaves from lance-shaped to 
oblong egg-shaped, tapering at each end on slender leaf-stalks, margins 
toothed with sharp teeth, blade of larger leaves 2 to 3 in. long. Flowers 
all in axillary whorls, the whorl not usually covering the flower stem. 
Calyx densely hairy. Wet places throughout our area. July-Oct. 
a. LY COPUS, 
Perennial herbs, with stolons or suckers, with erect or diffuse stems 
and opposite leaves; flowers in dense whorls at the leaf-axils, white or 
purple, Calyx tubular nearly regular, 4- or 5-toothed, the teeth spinous; 
corolla nearly equally 4-lobed, not distinetly 2-lipped. Fertile stamens 
2; ovary deeply 4-parted. Slender style, 2-parted at summit. 
Calyx teeth usually 4, the mature nutlets exceeding them in height . L. virginicus 
Calyx teeth 5, very sharp, exceeding the mature nutlets in height. 
Corolla twice as long as the calyx. 
Leaves. without leaf-stalks . . . .« »« »« »« « « 2 sessshfohus 
Leaves with leaf-stalks . . Cee imme Sh. ti 
Corolla not twice as long as the calyx. 
Leaves deeply incised . . L. americanus 
Leaves with coarse teeth at margins, not “deeply incised, oblong 
OF (ERR*AMHDEG? “a « aalieh au ade . « « JL. europaeus 
1. L. virginicus, L. (Fig. 3, pl. 131.) Bucarte Weep. Stem acutely 
4-angled, 4 to 2 ft. high; smooth or slightly downy; leaves oblong to 
