278 LABIATE. [MENTHA. 



TRIBE I. SATUREIJE.ffi. Corolla-lobes flat. Stamens 2-4, remote, spread- 

 ing or conniving under the upper lip, 2 upper shorter or ; anther-cells 

 contiguous or confluent. Nutlets free, smooth, or nearly so. 



* Corolla subregular. Stamens spreading ; anthers 2-celled. 



Perfect stamens 4 1. Mentha. 



Perfect stamens 2 2. Lycopus. 



** Corolla 2-lipped. Stamens distant. 



Erect, leaves broad. Calyx equally 5-toothed 3. Origanum. 



Procumbent, leaves small. Calyx 2-lipped 4. Thymus. 



*** Corolla 2-lipped. Stamens 4, conniving under the upper lip. 



Corolla-tube straight ; upper lip flat 5. Calamintha. 



Corolla-tube curved, ascending ; upper lip concave 5*. Melissa. 



TRIBE II. MONAR'DE-ffi. Stamens 2, erect or ascending ; anthers 1-celled, 



or if 2-celled cells remote. Nutlets free, smooth, or nearly so. 

 Calyx 2-lipped 6. Salvia. 



TRIBE III. NEPETE'-ffi. Stamens 4, 2 upper longer, ascending or diverging ; 



anther-cells 2 parallel or nearly so. Nutlets smooth or tubercled. 

 Upper lip of corolla truncate 7. Nepeta. 



TRIBE IV. STACHYDE JE. Stamens 4, parallel, 2 upper shorter, ascend- 

 ing under the concave upper lip or included in the tube. Nutlets free, 

 smooth, or tubercled. 



* Calyx 2-lipped, not inflated, lips closing over the fruit. 



Filaments 2-fid, anthers all 2-celled 8. Prunella. 



Filaments simple, 2 lower anthers 1 -celled 9. Scutellaria. 



** Calyx inflated or 2-lipped. Anthers under the corolla lip 10. Melittis. 



*** Calyx tubular. Anthers within the corolla-tube 11. Marrubium. 



**** Calyx 5-10-toothed, subcampanulate, equal or oblique. 



- Calyx 5-toothed. Anthers glabrous. Nutlets obtuse 12. Stachys. 



Calyx-teeth 5, spinous. Anthers ciliate. Nutlets compressed... 13. Galen] >M*. 

 Calyx -teeth 5, spinous. Anthers glabrous. Nutlets 3-quetrous, truncate. 



13*. Leonurus. 



Calyx 5-nerved. Anthers hairy. Nutlets 3-quetrous, truncate... 14. Lainium. 

 Calyx-limb spreading ; teeth 5 broad. Anthers glabrous. Nutlets obtuse. 



15. Ballota. 



TRIBE V. AJ'UGOIDEJE. Stamen* 4, parallel, ascending, exserted, 2 upper 

 shorter. Nutlets connate, base oblique, reticulate and rugose. 



Calyx tubular, 5-toothed. Upper corolla-lip 2-partite 16. Teucrium. 



Calyx ovoid, 5-cleft. Upper corolla-lip entire or notched 17. Ajuga. 



1. MEN'THA, L. MINT. 



Strong-scented perennial herbs ; rootstock stoloniferous, creeping. 

 ll'lioi-ls many-flowered, axillary and remote, or crowded and forming ter- 

 minal spikes ; bracts subulate or foliaceous ; bracteoles small or ; flowers 

 small. Calyx campanulate or tubular, 5-toothed ; throat naked or villous. 

 Corolla-tube short, limb campanulate 4-lobed ; lobes nearly equal, upper 

 broader. Stamens 4, equal, erect, distant, glabrous ; anther-cells parallel. 

 Style shortly 2-fid. Nutlets dry, smooth. DISTKIB. Chiefly natives of N. 



