THE DEAD-NETTLE FAMILY 
107 
Flower-clusters in spikes or heads. 
(1) Round-leaved Mint. (Men'tha rotundifolia.) — Flowers in slender branched spikes ; 
corolla hairy ; leaves roundish, stalkless, shaggy underneath, wrinkled. 
(2) Broad-leaved Horse Mint. (Men'tha alopecuroides.) — Flowers in slender branched 
spikes ; corolla hairy ; leaves round, very shortly stalked, hairy underneath. 
(3) Horse Mint. (Men'tha longifdlia.) — Flowers in slender branched spikes ; corolla hairy ; 
leaves narrowly egg- or lance-shaped, hairy, stalkless. 
(4) *Spear Mint. (Men'tha spicata.) — Flowers in slender branched spikes ; corolla smooth ; 
leaves smooth, narrowly egg- or lance-shaped, almost stalkless. 
(5) Peppermint. (Men'tha piperita.) — Flowers in blunter, more interrupted spikes ; corolla 
smooth ; leaves smooth, egg-shaped, distinctly stalked. 
(6) Marsh Mint. (Men'tha aquat'ica.) — Flowers in round or oblong heads, often with one or 
two clusters below. 
Flower-clusters distant. 
(7) Marsh Whorled Mint. (Men'tha gentil'is.) — Calyx tubular and the teeth narrow ; corolla 
smooth ; leaves large, egg-shaped, stalked. 
(8) Tall Red Mint. (Men'tha rubra.) — Calyx tubular and the teeth narrow ; corolla smooth ; 
leaves with purple veins, stalked. 
(9) Cardiac Mint. (Men'tha gracil'is.) — Calyx tubular and the teeth narrow; corolla 
smooth ; leaves narrow, stalked. 
(10) Corn Mint. (Men'tha arven'sis.) — Calyx short and bell-shaped and the teeth broad; 
corolla hairy ; leaves narrow, stalked. 
(11) Pennyroyal. (Men'tha Pul^gium.) — Calyx tubular, the throat closed with hairs; leaves 
small, stalked. 
1. Round-leaved Mint. (Men'tha rotundifdlia. Huds.) — As just described. The 
small flowers are about £ inch long, lilac or white, in dense, slender, cylindrical, sometimes inter- 
rupted spikes, usually 2 or 3 together forming a branched cluster (panicle), with lance-shaped 
bract-like leaves under the clusters ; the corolla is hairy outside ; the stem is 1-3 feet high, much 
branched, and the leaves are stalkless (sessile), roundish or broadly egg-shaped, toothed (serrate) 
or scalloped (crenate), much wrinkled (rugose), slightly hairy on the upper and shaggy on the 
under surface. The whole plant is hairy and has a strong acrid but not agreeable scent. 
Rare. In waste places ; in England, Scotland, and Ireland. August — September. Perennial. 
2. Broad-leaved Horse Mint. (Men'tha alopecuroides. Hull.)— This species is inter- 
mediate between the Round-leaved Mint (Mentha rotundifolia) and the following species, the 
Horse Mint (Mentha longifolia). It differs from the former in having larger flowers in short, 
stout spikes, narrower bracts, and rounder, larger leaves which are hairy, not shaggy, underneath 
and are very shortly stalked. 
Rare. In waste and damp places, chiefly in the east of England and the west of Scotland. 
August— September. Perennial. 
3. Horse Mint. (Men'tha longifolia. Huds.) — A similar species to the Round- 
leaved Mint (Mentha rotundifolia) but with larger flowers in similar dense, rather slender, 
cylindrical spikes, usually several together forming a branched cluster (panicle) ; the bract-like 
leaves are narrower and longer (subulate) ; the stem is 2-3 feet high, less branched and shaggy ; 
the leaves are narrowly egg-shaped or lance-shaped, almost stalkless, silky white underneath, and 
not wrinkled ; and the scent is strong and sweet. ( Mentha sylvestris. Linn.) 
