MINT FAMILY 521 
Calyx tube 5- to 10-nerved, corolla tube longer than the 
calyx. Anther sacs parallel. Lower leaf-stalks very 
HOR face ae rs) sk) a, aa ae | 6 oes) BETONICA 
6. The Skullcap Tribe 
Corolla 2-lipped. Stamens 4, shorter than the upper lip of the 
corolla and ascending under it. The upper lip arched over sta- 
mens. 
Calyx deeply 2-lipped, 10-nerved, upper lip of 3 short teeth, 
lower of 2 lance-shaped teeth . P et) oe RUIN ETAT A 
Calyx with a protuberance on the upper side ee) SCULELEARTA 
Calyx without a protuberance. 
Calyx spiny-pointed’ = 2) . = = & -« « «= «| MARRUBIOM 
Galyssinot spiny-pointed = 2 =. = 9. «= «) » « ‘MEERANTA 
7. The Catmint Tribe 
Corolla 2-lipped; stamens 4, the posterior (upper) longest. Anther 
cells divergent or parallel. Stamens shorter or scarcely longer 
than the upper lip of the corolla. 
Calyx tubular with 5 sharp teeth, not 2-lipped, but the upper 
2 teeth longer than the 3 lower, 15-nerved, erect plant . NEPETA 
Anther sacs diverging and at right angles to the connecting 
bridge. Creeping herb. . . GLECOMA 
Calyx with 5 sharp teeth, the upper Harecst: the naHole calyx 
covered with long hairs. Calyx tubular, 15-nerved DRACcOocEPHALUM 
Anther cells parallel or nearly so. aa tall herbs, with long 
cylindric clusters of flowers . . Ae ies styess AGAS TACHI 
8. Horse Balm Tribe 
Of the 5 lobes of the corolla 4 are nearly equal, while the 5th is 
very long and dependent, its border fringed . . . . COLLINSONIA 
9. Wood Sage Tribe 
Corolla border very irregular, stamens 4, extending beyond the tube 
of the corolla, the anterior longer. Calyx 5- to 10-nerved. 
Corolla border very irregular; tube straight; the upper lip very 
SHOUCe Hom ey ho bo . . AJUGA 
Corolla border very areepaiae the tube and parts of the border 
hairy, stamens longer than corolla . . %. . . . TEUCRIUM 
Corolla small, with spreading lobes; aoe short; stamens very 
much longer than corolla . . . . . TRICHOSTEMA 
Calyx tubular, corolla small, the lobes distinct and rounded, 
stamens shorter than corolla . . . . . . . . ISANTHUS 
+ Corolla of 4 nearly equal divisions, one of which is concave at the sum- 
mit. Stamens 4, in Mentha all fertile, in Lycopus 2 fertile 
1. MENTHA, L. 
Aromatic herbs, with 4-angled stems and dentate bordered leaves. 
Flowers white, pink or purple, in axillary clusters or in dense terminal 
