98 THE FLORA OF THE ALPS 
lets; stem always square; leaves always opposite and 
decussate, often glandular and fragrant. A very large 
order, belonging chiefly to the Temperate Zone. 
I. MENTHA, L. 
Flowers small, in dense axillary cymes, often com- 
bined into leafy spikes; corolla-tube short, limb 4-lobed ; 
stamens nearly equal; whole plant usually strongly fra- 
grant. Not alpine. 
The Swiss species of Mint are the same as the English, 
viz.:—In wet places, road-sides, &c.:—W. sylvestris, L. 
(including zemorosa, Willd.), Horse-mint ; with whorls in 
terminal spikes and obovate or lanceolate leaves; J. 
rotundifolia, L.; similar, but leaves nearly round, shaggy; 
M. piperita, Huds., Pepper-mint; very strongly scented, 
with glabrous stalked leaves; JZ. aquatica, L.; with 
softer leaves, and very crowded whorls; very common ; 
M. sativa, L. (including rubra, Sm., gracilis, Sm., pra- 
tensis, Sol., and genitzlzs, L.); distinguished from the last 
by the inflorescence being more concealed in the leaves. 
In cultivated land :—JV/. arvensis, L.; a very hairy pros- 
trate plant; very common; J/. Pulegium, L., Penny- 
royal; a smaller plant, whorls quite distinct, calyx 2- 
lipped. Other forms described are probably hybrids. 
a Tycopus, iy 
Flowers small, in dense axillary sessile cymes; calyx 
nearly regular, 4-5-toothed; corolla nearly regular ; 
stamens 4, two of them imperfect. Not alpine. 
L. europeus, L., Gipsy-wort; stem 2-3 ft., flowers 
very small, white dotted with purple ; wet places. 
