MEi!fTHA. 267 



13. Galeopsis. Anth. approaching in pairs ; cells opposite 

 bursting hy 2 valves transversely. Upper lip of cor. arched ; 

 lower lip 3-lobed with 2 teeth on its upper side, lohes un- 

 equal. Cal. tubular, 6-toothed; teeth, equal or 2 upper 

 ones longest. Nuts rounded at the end. 



14. Stachys. Anth. approaching in pairs ; cells diverging, 

 bursting longitudinally. Upper lip of cor. concave; lower 

 of 3 unequal lobes. Cal. tubular-beUshaped vrith 5 equal 

 teeth. Nuts blunt and convex at the end. 



15. Ballota. Anth. ajproaching in pairs ; cells diverging, 

 bursting longitudinally. Upper lip of cor. erect, concave ; 

 lower 3-lobed, middle lobe cordate. Cal. funnelshaped with. 

 5 equal teeth. Nuts convex and rounded at the end. 



** Stamens falling short of the tube of the corolla. 



16. Maebubitjm. Anther-cells diverging, bursting longitu- 

 dinally. Upper lip of cor. straight, erect, flattish, cloven ; 

 lower 3-lobed, middle lobe the largest. Cal. tubular, teeth 

 nearly equal or 2 longer. Nuts flatly truncate. 



Tr. VU. AJVGOIDEM. Cor. with the upper Up very short, 

 or deeply bifid and appearing aa if wantiag. 



17. Tbtjceium. Stam. parallel, protruded between the lobes 

 of the upper lip of the cor., inferior longest ; cells bursting 

 longitudinally. Cor. with the uppei' lip deeply bifid, lobes 

 long ; lower lip 3-lobed. Cal. tubular, 5-toothed ; the 

 teeth equal or the upper one larger (2-lipped). 



18. Ajuga. Stam. parallel, protruded far beyond the upper 

 lip of the cor., inferior longest; cells bursting longitudinally. 

 Cor. toith the upper lip very short, 2-lobed ; lower 3-lobed, 

 much longer than the upper. Cal. ovate-bellshaped, nearly 

 equally 5-cleft. 



Tribe I. Menthoidem. 



1. Men'tha Linn. Mint.' 



* Throat of the calyx naked, Oeneral inflorescence determinate. 

 Whorls off,, in terminal spikes or clusters. — t Stoles aerial, 

 leafy. 



tl. M. vir'idis (L.) ; /. glabrous subsessUe lanceolate acute 

 serrate, spikes lax cylindrical, bracts subulate, cor. glabrous. — 



^ See Mr. Baker's valuable paper in J. of B, iii. 233. 



N 2 



