LABIATE. ^MINT FAMILY.) 301 



1L 8ATUREIA. Calys 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, flaUish on the upper side. Tube of the 

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

 4- 4- *- 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. 



16. COLLINSONIA. Calyx enlarged and declined in fruit, 2-lipped Lowr lobe of the coroll* 

 much larger than the other four. 



TRIBE HI. MONAR.Df3.33. 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 VIA. 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 cella conflu- 



ent into one : connective inconspicuous. 



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



TRIBE IV. NEPETE^E. Stamens 4, the superior (inner) pair longer than the inferior ! 

 ascending or diverging. Corolla 2-lipped : the upper lip concave or arched, tha 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-eel's nearly parallel. 



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



widely diverging Calyx curved. 



21. DRACOCEPHAL T J \ r ^aiuens nearly as in No. 20. Calyx straight, the upper lip or tooth 



commonly larger. 



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



TKIBE V. STACHYDE^E. 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 ill 

 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. PHYSOSTEG1A. 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 SCUTELLARIA. 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. MARRUB1UM. Calyx tubular, 5 - 10-nerved, and with 5 or 10 awl-shaped teeth 



- - Stamens projecting beyond the tube of the corolla. 

 M- 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. 



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



