LABIATAE (MINT FAMILY) 691 



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



8. Isanthus. Calyx bell-shaped. Corolla small, the lobes spreading. Stamens included. 



4. Trichostema. Corolla-lobes all declined. Calyx oblique. Stamens much exserted. 



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



Tribe II. SCUTELLARlEAE. Stamens 4, ascending and parallel. Calyx bilabiate, closed in fruit ; 

 the rounded lips entire. Corolla bilabiate, the upper lip arched. 



5. Scutellaria. Calyx with a helmet-like projection on the upper side. 



Tribe III. STACH^EAE. Stamens ascending or spreading, extended straight forward. Calyx 

 usually open in fruit, without a projection on the upper side. 



* Stamens and style included in the corolla-tube. 



6. Marrubium. Calyx tubular, 5-10-nerved, and with 5 or 10 awl-shaped teeth. 



* * Stamens exserted beyond the corolla-tube. 



- 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. 



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



7. Agastache. Stamens divergent, exserted ; upper pair declined, lower ascending. 



8. Meehania. Stamens all ascending, not exceeding the lip of the corolla. 



H- -H- Anthers more or less approximate in pairs ; their cells divaricate or divergent ; filaments 



ascending, not exserted. 



9. Nepeta. Calyx more or less curved, equally 5-toothed. 



10. Dracocephalum. Calyx straight, the uppermost tooth much the largest. 



i- - Stamens 4, parallel and ascending under the galeate or concave upper lip, the lower (outer) pair 

 longer (except in nos. 14 and 17) ; calyx 5-10-nerved, not 2-lipped (except in no. 11). 



H- Calyx reticulate-veiny, deeply bilabiate, closed in fruit. 



11. Prunella. Calyx nerved and veiny ; upper lip flat, 3-toothed, the lower 2-cleft. 



H- -H- Calyx thin, inflated in fruit, obscurely nerved, 3-5-lobed, open. 



12. Physostegia. Calyx 5-toothed or 5-lobed. Anther-cells parallel. 



13. Synandra. Calyx almost equally 4-lobed ! Anther-cells widely divergent. 



H- -H- - Calyx of firmer texture, distinctly 5-10-nerved or -striate, 5-10-toothed. 

 = Stamens not deflexed after anthesis ; naturalized from the Old "World. 



14. Phlomis. Calyx tubular, the 5 teeth abruptly awned. Upper lip of the corolla arched. 



15. Galeopsis. Calyx tubular-bell-shaped, the 5 teeth spiny-pointed. Anthers transversely 



2-valved, the smaller valve ciliate. 



16. Lamium. Calyx-teeth not spiny-pointed. Nutlets sharply 3-angled, truncate. 



17.' Leonurus. Calyx top-shaped, the rigid spiny-pointed teeth soon spreading. Nutlets trun- 

 cate and acutely 3-angled at top. Leaves cleft or incised. 



18. Ballota. Calyx somewhat funnel-form, expanding above into a spreading 5-toothed border. 



Nutlets roundish at top. Upper lip of the corolla erect. 



= = Stamens often deflexed or contorted after anthesis. 



19. Stachys. Calyx tubular-bell-shaped, equally 5-toothed or the 2 upper teeth united into 1. 



Nutlets rounded at top. 



+ +- +- Stamens 2, ascending and parallel ; anthers apparently or really 1-celled ; corolla strongly 



2-lipped. 



20. 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. 



21. Monarda. Calyx tubular and elongated, equally 5-toothed. Anthers of 2 cells confluent into 



1, the connective inconspicuous. 



22. Blephilia. Calyx ovoid-tubular, 2-lipped. Anthers as in the preceding. 



