404 LABIATE. (MINT FAMILY.) 



I. Nutlets rugose-reticulated, attached obliquely or ventrally ; ovary merely 



4-lobetl. 



Tribe I. AJUGOIDEJE. Stamens 4, ascending and parallel, mostly exserted from 

 the upper side of the corolla. Calyx 5- 10-nerved. 



* Limb of corolla merely oblique, of 5 nearly equal and similar lobes. 



1. Trichostema. Corolla-lobes all declined. Calyx oblique. Stamens exserted. 



2. Isantbus. Calyx bell-shaped. Corolla small, the lobes spreading. Stamens included. 



* * Limb of corolla irregular, seemingly unilabiate, the upper lip being either split down 



or very short ; stamens exserted from the cleft. 



3. Tewcrium. Corolla deeply cleft between the 2 small lobes of the upper lip. 



4. Ajuga. Corolla with a very short arid as if truncate upper lip. 



II. Nutlets smooth or granulate ; scar basal, small ; ovary deeply 4-parted. 



Tribe II. SATUREINE^E. Upper pair of stamens shorter or wanting; anthers 2- 

 celled. Upper lip of corolla not galeate or concave. 



* Flowers in loose terminal panicled racemes ; calyx 2-lipped, enlarged and declined in fruit. 



5. Collinsonia. Lower lobe of corolla fimbriate, much the largest. Stamens 2. 



6. Perilla. Corolla short, the lower lobe little larger. Stamens 4, included. 



* * Flowers in more or less crowded clusters or whorls, axillary or spicate. 

 +- Corolla not evidently 2-lipped, but almost equally 4-lobed, small. Stamens erect, distant. 



7. Mentha. Fertile stamens 4, nearly equal. 



8. Lycopus. Fertile stamens 2, and often 2 sterile filaments without anthers. 



i- +- Corolla more or less 2-lipped. 



* Stamens distant and straight, often divergent, never convergent nor curved. 

 = Stamens 2, with or without rudiments of the upper pair. 



9. Cunila. Calyx very hairy in the throat, equally 5-toothed. Corolla small. 



= = Stamens 4 ; calyx 10-13-nerved, and hairy in the throat (except n. 10). 

 10. Hyssopus. Calyx tubular, 15-nerved, equally 5-toothed. Stamens exserted. 



II. Pyciiaiithemurn. Calyx ovate or short-tubular, equally 5-toothed or somewhat 2- 



lipped. Flowers in dense heads or clusters. 



12. Origanum. Calyx ovate-bell-shaped, 5-toothed. Spikes with large colored bracts. 



13. Tiiymus. Calyx ovate, nodding in fruit, 2-lii>ped. Bracts minute ; leaves very small. 

 H- + Stamens (often 2 only in n. 1G) ascending or arcuate, often more or less converging (or 



ascending parallel under the erect upper lip in n. 14 and 15). 



14. Sattireia. Calyx hell-shaped, 10-nerved, naked in the throat, equally 5-toothed. 



15. Calami nt ha. Calyx tubular, often hairy in the throat, 13-nerved, 2-lipped. Tube of 



corolla straight. 



16. Melissa. Calyx tubular-bell-shaped, flattish on the upper side. Corolla curved upward. 



17. Hedeoma. Calyx gibbous on the lower side, hairy in the throat. Flowers loose. 



Tribe III. MONAKDE^E. Stamens 2, ascending and parallel ; anthers apparently or 

 really 1-celled. Corolla strongly 2-lipped. 



18. Salvia. Calyx 2-lipped. Anthers with a long connective astride the filament, bearing 



a linear cell at the upper end, and none or an imperfect cell on the lower. 



19. Monarcla. Calyx tubular and elongated, equally 5-toothed. Anthers of 2 cells con- 



fluent into one, the connective inconspicuous. 



20. Blephilia. Calyx ovate-tubular, 2-lipped. Anthers as in the last. 



Tribe IV. NEPETE^E. Stamens 4, the upper (inner) pair longer than the lower, 

 ascending or diverging. Corolla 2-lipped ; the upper lip concave or arched, the lower 

 spreading. Calyx mostly 15-nerved. 



* Anthers not approximate in pairs ; their cells parallel or nearly so. 



21. !Lophanthus. Stamens divergent, exserted ; upper pair declined, lower ascending. 



22. Cedronella. Stamens all ascending, not exceeding the lip of the corolla. 



