252 58. LABIATE. 



** Stamens included in the tube of the corolla. 



17. MARRUBIUM. 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. VIII. AJUGOIDE^E. Cor. with the upper lip very short, 

 or deeply bifid and appearing as if wanting. 



18. TEUCRIUM. Stara. parallel, protruding between the deeply 

 divided lobes of the upper lip of the cor., inferior longest ; 

 cells bursting longitudinally. Cor. with the upper lip deeply 

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

 teeth equal or the upper one larger. 



19. AJUGA. Stam. parallel, protruding far beyond the upper 

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

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

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

 equally 5-cleft. 



Tribe I. Menthoidea. 

 1 . MENTHA Linn. Mint. 



* Throat of the calyx naked. Inflorescence determinate. Fl. in 

 spiked whorls or terminal heads. 



1. M. rotundifolia (L.); I. sessile 'elliptic-obtuse crenate-serrate 

 wrinkled shaggy beneath, spikes linear-cylindrical dense, bracts 

 lanceolate, " fr.-cal. not contracted at the mouth." E. B. 446. 

 Sole Menth. 3. Viscid. L. usually with a cordate base. Whorls 

 of spike nearly all close together. Scent acrid. Waste places, 

 rare. P. VIII. IX. Round-leaved Mint. E. I. 



2. M. sylvestris (L.) ; I. subsessile ovate or lanceolate serrate 

 silky beneath, spikes linear-cylindrical dense, bracts subulate, 

 " fr.-cal. contracted at the mouth." E. B. 686. Sole 1. and 2. 

 L. sessile, rarely cordate below. Whorls of spike nearly all close 

 together. Scent sweet. a. L. lanceolate, acute, rather narrowed 

 below. /3. M. velutina (Lej.) ; 1. elliptical-cordate. M. rotun- 

 difolia Sole 4. Waste ground in damp places. P. VIII. IX. 

 Horse Mint. E. S. 



3. M. viridis (L.) ; I. glabrous sessile lanceolate acute serrate, 

 spikes lax cylindrical, bracts subulate. E. B. 2424. Sole 5. 

 Cor. glabrous. Whorls of the spike rather distant. L. glandu- 

 lar beneath. . crispa (Benth.). In marshy places, rare. 

 . Glen Farg, Perthshire. Hooker. P. VIII. Spear Mint. 



