LABIATE. (MINT FAMILY.) 311 



TRIBE II. S ATUREIE JE. Stamens 2 or 4, straight and spreading, or connivent undet 

 the upper Jip ; the upper pair shorter, or abortive. Anthers 2-celled. Nutlets smooth, 

 distinct. 



Corolla-lobes nearly equal. Stamens distant. 



3. MENTIIA. Fertile stamens 4. Whorls spiked. Nutlets obtuse. 



4. LYCOPUS Fertile stamens 2. Whorls axillary. Nutlets truncate. 



* * Corolla 2-lipped. Stamens straight, distant, spreading. 



5. CUNILA. Stamens 2. Calyx equally 5 toothed, hairy in the throat. 



6. PYCNANTHEMUM. Stamens 4. Calyx 2.1ipped or & toothed, naked in the throat, 



7. COLLINSONIA. Stamens 2 or 4. Calyx 2-lipped, the upper lip truncate, 3-toothed. Co- 



rolla fimbriate. 

 * * Corolla 2-lipped. Stamens ascending and spreading above, or connivent under the 



upper lip. 

 + Fertile stamens 2 , the two sterile ones small. 



8. HEDEOMA. Calyx 13-nerved, 2 lipped, the lower lip hispid. 



+ + Fertile stamens 4. Calyx 13-nerved. 



9. MICKOMERIA. Calyx-teeth nearly equal. Flowers solitary. Low herbs. 



10. CALAMINTHA. Calyx 2-lipped. Flowers in cymes. Anthers awnless. Chiefly shrubs. 



11. DICERANDRA. Calyx 2-lipped. Anther-cells awned. Branching annuals. 



12. MELISSA. Calyx tubular -bell-shaped, flattened on the upper side. Tube of the corolla 



curved upward. 



TRIBE III. MONAR.DE.3E. Stamens 2, ascending and parallel. Anthers 1 celled, or 

 with 2 confluent cells. Calyx and corolla 2-lipped. Nutlets smooth, distinct. 



13. SAL VIA. Connective of the anther elongated, oblique ; the upper cell fertile; the lower 



abortive or wanting. 



14. MONARDA. Anther 2-celled, the cells confluent. Calyx-teeth equal. 



15. BLEPHILIA. Anther 2-celled, the cells confluent. Calyx 2-lipped; the upper teeth awned. 

 TRIBE IV. NEPETE^:. Stamens 4, the upper pair longer Nutlets smooth, distinct. 



16. LOPHANTHUS. Upper stamens curving downward ; the lower ascending. Anther-cells 



parallel. 



17. NEPETA. Stamens all ascending. Anther-cells diverging. 



18. CEDRONELLA. Stamens all ascending. Anther-cells parallel. 



TRIBE V. ST AC HYDEJE. Stamens 4; the lower pair longer, parallel, ascending 

 Upper lip of the corolla concave or keeled. Calyx 3 - 10-toothed or lobed. Nutlets 

 smooth, distinct. 



* Calyx 2-lipped, closed in fruit. 

 Ifc. BRUNELLA. Lips of the calyx toothed. Flowers 3 in a cluster, spiked. 



20. SCUTELLARIA. Lips of the calyx entire ; the upper one appendaged. Flowers single, 



opposite. 



* * Calyx not 2-lipped ; the teeth or lobes spineless. 



21. MACBRIDEA. Calyx 3-lobed. Flowers capitate, in crowded 4-flowered whorls. 



22. PHYSOSTEGIA. Calyx 5-toothed. Flowers opposite, spiked. Nutlets 3 angled. 



23. LAMIUM. Calyx 5-toothed. Flowers in axillary cymes. Nutlets truncated. 



* * Calyx not 2-lipped ; the teeth rigid or spiny. 



24. MARRUBIUM. Calyx-teeth 10, nearly equal. Stamens included. Herbs woolly. 



25. LEONOTIS. Calyx-teeth 8-10. very unequal. Stamens exserted. Whorls globose. 



26. LEONURUS. Calyx-teeth 5. Nutlets obtuse, not truncate. Leaves incisely lobed 



27. STACHYS. Calyx-teeth 5. Nutlets truncate, sharp-angled. Leaves undivided. 



TRIBE VI. A JUGE JE. Stamens 4, ascending, parallel, exserted. Nutlets reticulated 

 and pitted, their bases partially united within. 



* Stamens barely exserted, nearly equal. 

 23. ISANTHUS. Lobes of the corolla and calyx nearly equal. Peduncles 1 - 3-flowered. 



