LABIATES. (MINT FAMILY.) 301 



11. RA rUREIA. Caly* bell-shaped, naked in the throat, 10-nerved, equally 5-toothed. Sta- 



mens somewhat ascending. 



12. CALAMINTHA. Calyx tubular, often hairy in the throat, 13-nerved, 2-lipped. Tube of 



the corolla straight. Stamens connivent at the summit in pairs under the upper lip 

 18. MELISSA. Calyx tubular-bell-shaped, 2-lipped, flattish on the upper side. Tube of th 

 corolla curved upwards. Stamens curved above, connivent under the erect upper lip 

 )-*-(- Stamens only 2 with anthers, ascending, and a pair of small sterile filaments. 



14. HEDEOMA. Calyx gibbous on the lower side, hairy in the throat. Flowers loose. 



* * * Corolla 2-lipped, with a bearded ring inside at the bottom of the enlarged throat. Sta- 

 mens 2 or 4, long, diverging. 



15. COLLINSONIA. Calyx enlarged and declined in fruit, 2-lipped. Lower lobe of the corolla 



much larger than the other four. 



TRIBE in. MONARDE^E. Stamens 2 (sometimes with mere rudiments of the upper 

 pair), ascending and parallel : anthers apparently or really 1-celled. Corolla 2-lipped. 

 Nutlets as in Tribe II. 



16. SAL VI A. Calyx 2-lipped. Anthers with a long connective astride the filament, bearing 



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



17. MONARDA. Calyx tubular and elongated, equally 5-toothed. Anthers of 2 cells conflu- 



ent into one : connective inconspicuous. 



18. BLEPHILIA. Calyx ovate-tubular, 2-lipped. Anthers as in No. 17. 



TBIBK IV. NEPETE JK. Stamens 4, the superior (inner) pair longer than the inferior ! 

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

 spreading. Calyx mostly 15-nerved. Nutlets as in Tribes II. and III. 



19. LOPHANTHUS. Stamens divergent ; the upper pair curved downwards ; the lower as- 



cending : anther-cells nearly parallel. 



20. NEPETA. Stamens all ascending ; the anthers approximate in pairs ; the cells at length 



widely diverging. Calyx curved. 



21. DRACOCEPHALUM. Stamens nearly as in No. 20. Calyx straight, the upper lip or tooth 



commonly larger. 



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



TRIBE V. STACHYDE JE. Stamens 4, ascending and parallel ; the inferior (outer) 

 pair longer than the superior, except in No. 33 Anthers usually approximate in pairs. 

 Corolla 2-lipped ; the upper lip concave or arched. Calyx 6-10 nerved. Nutlets as in 

 the preceding. 



* Calyx not 2-lipped, thin and membranaceous, inflated-bell-shaped in fruit. 



23. SYNANDRA Calyx 4-lobed ! Anther-cells widely diverging from each other. 



24. PHYSOSTEGIA. Calyx 5-toothed. Anther-cells parallel. 



* * Calyx 2-lipped, closed in fruit. 



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



26. SCCTELLARIA. Calyx with a helmet-like projection on the upper side ; the lips entire 



* * * Calyx not 2-lipped, nor the tube inflated, 5 - 10-toothed. 

 t- Stamens included in the tube of the corolla. 



27. MAR11UBIUM. Calyx tubular, 5 - 10-nerved, and with 6 or 10 awl-shaped teeth 



i- -t- Stamens projecting beyond the tube of the corolla. 

 H- Anthers opening transversely by 2 unequal valves ; the smaller valve ciliate. 



28. GALEOPS1S. Calyx tubular-bell-shaped ; the 5 teeth spiny-pointed. 



H- ++ Anthers opening lengthwise. 



29. STACHYS. Calyx tubular-bell-shaped. Nutlets rounded at the top. Stamens after shed- 



ding the pollen often turned downward. 



80. LEONURUS. Calyx top-shaped, the rigid and spiny-pointed teeth soon spreading Nut- 



lets truncate and acutely 3-angled at the top. 



81. LAMIUM. Calyx-teeth not spiny pointed. Nutlets sharply 3-angled, truncate at the top. 



26 



