315 
LABIATJE. (MINT FAMILY.) 
27. Stachys. Calyx 5-10-nerved, 5-toothed. Throat of the corolla 
scarcely dilated. Achenia obtuse. Stamens projecting be¬ 
yond the tube of the corolla. 
28. Marrubium. Calyx tubular, mostly 10-toothed; the teeth some¬ 
what spine-like. Stamens included in the tube of the corolla. 
29. Ballota. Calyx funnel-form, 5 - 10-toothed. Stamens pro¬ 
jecting beyond the tube of the corolla. 
30. Phlomis. Calyx tubular, 5-toothed, the truncate teeth abruptly 
awned. Upper lip of the corolla strongly arched. 
Stamens curved, ascending and much longer than the corolla, 
projecting from its upper side. 
31. Trichostema. Calyx unequally 5-cleft. Limb of the corolla 
somewhat equally 5-cleft; the lobes declined. 
32. Teucrium. Calyx equally or unequally 5-toothed. Corolla 
deeply cleft between the 2 upper lobes, the stamens exserted 
from the cleft. 
1. ISAKTHUS, Michx. False Pennyroyal. 
Calyx bell-shaped, deeply 5-toothed, equal. Corolla scarcely 
longer than the calyx ; the border bell-shaped, with 5 nearly equal 
and rounded spreading lobes. Stamens 4, slightly didynamous, 
erect, distant, scarcely as long as the corolla. Achenia wrinkled 
and pitted.—A low and branching annual herb, clammy-pubes¬ 
cent, with entire oblong-lanceolate strongly 3-nerved leaves, and 
small pale blue flowers on short axillary 1 - 3-flowered peduncles. 
(Name from to-os, equal , and avOos, flower , referring to the nearly 
regular corolla.) 
1. I. caeriileus, Michx. — Gravelly banks, Maine and New 
York to Ohio, and south westward. July, Aug. 
2. MENTHA, L. Mint. 
Calyx bell-shaped or tubular, 5-toothed, equal or nearly so. 
Corolla with a short included tube ; the bell-shaped border some¬ 
what equally 4-cleft; the upper lobe broadest, entire or notched at 
the apex. Stamens 4, equal, erect, distant. Achenia smooth. — 
Odorous herbs, with the small flowers mostly in close clusters 
forming axillary capitate whorls, sometimes approximated in in¬ 
terrupted spikes. Corolla pale purple or whitish. (MivOrj of 
Theophrastus, from a Nymph of that name, fabled to have been 
changed into Mint by the jealous Proserpine.) 
* Nearly smooth : naturalized. 
