244 MINT FAMILY. 



5. COLEUS. Calyx as in No. 4. Corolla similar, but the lower lobe longer and 



concave or boat-shaped, enclosing the stamens and style: filaments raonadel- 

 phous. 



6. HYPTIS. Calyx with 6 less unequal or equal teeth. Corolla of 4 short simi- 



lar upper lohes, and a longer ahruptly deflexed saccate lower one; filaments 

 separate. 



7. LAVANDULA. Calyx not deflexed, 13-15-nerved, 5-toothed, the upper tooth 



mostly larger. Corolla with tube longer than the calyx, regularly 2-lipped, 

 i. e. upper lip 2-lobed, lower 3-lobed, the lobes all equally spreading. Sta- 

 ' mens included, but declined towards the lower lobe oi^ the corolla. 



§ 3. Stamens 4 {and the lower or outer pair longest) or 2, straight and distant or 

 diverging; anthers plainly 2-celled, not conniving in p'lirs. Lobes of the 

 coi-olia fiat and spreading^ w the vjjper ei'ect but not arched. 



* Corolla short and rather bell-shnpal. hardly if at all 2-lipped, the i or rarely 5 



lobeSi nearly equal and all spi'eading. 



S. PERILLA. Calyx in flower 5-cleft, in fruit nodding and enlarging, becoming 



2-lipped. Corolla 5-cleft, the lower lobe u little longer. Stamens 4, neiu-ly 



equal. Style deeply 2-cleft. 

 9. MENTHA. Calyx equally 5-toothed. Corolla with a 4-cleft border, tlie upper 



lobe a little broader and sometimes notched at the end. Stamens 4, nearly 



equal, similar. 



10. LYGOl^US. Calyx 4-5-toothed. Corolla with 4 about equal lobes. Stamens 



2 : the upper pair, if any, without anthers. 

 « » Corolla evidently 2-lipped, but all the lobes of nearly equnl lengtli, the vpper lip 

 erect and mostly noti hed, the lower spreading ami 3-cleJ't, the tube not bearded 

 willi^ : stainenswllh anthers only i.. r )' ^ ''' " 



11. CUNILA. Calyx equally 5-toothed, striate, very hairy in the throat, one half 



shorter than the corolla. Stamens 2, long and proti-uduig: no rudiments of 

 the other pair. 

 ;;2v HEDEOMA. Calyx 2-lipped, gibbons on the lower side near the base, hairy 

 in the thi-oat. Corolla short. Startiens 2, with anthers scarcely protruded, 

 and 2 sterile short filaments tipped with a little head in place of anther. 



• « » Qyrolla elongated and irregular: the lower lobe or Up much the larger, pen- 



, dent, cut-toothed or fringed, the 4 Qthers nearly equal and alike: tube with (i 

 bearded ring inside at the bottom of the enlarged throat : stamens 2 aith 

 anthers orrarely 4. 



13. COLLINSONIA. Calyx ov.atc, enlarging and turned down after flowering, 



2-lipped, the upper lip flat and 3-tootliod, the lower 2-cleft. Cells of the an- 

 ther diverging. 



« « « * Corolla evidently 2-lipped, short, the upper lip erect or somewhat spread- 

 ing and nearly entire or notched, the lower spreading or 'A-cleft : staiaens with 

 anthers 4. 



14. HYSSOPUS. Calyx tubular, 15-nerved, equally 5-toothed, naked in the throat. 



Corolla with the middle lobe of the lower lip larger and 2-cleft. Stamens 

 very long and protruding. 



15. PYCNAN'l HE51UJI. Calyx oblong or short-tubular, about l.?-nei-ved, equally 



5-toothert or somewhat 2-lipped, naked in the throat. Corolla with the lobes 

 ,o rM?Trf , xTTT^f ■" '.? ?™'® """^ m^wQ. Flowers crowded in heads or close cv-raes. 



16. UKlLrANUJl. Calyx hairy in the 'throat, aboMt IS-nerved. Lower lip of tlie 



corolla of 3 similar lobes. Flowers crowded into spike-like clusters and fur- 

 nished with imbricated often colored bracts. 



17. THYMUS. Calyx ovate, hairy in the throat, IS-nei-ved, 2-lipped; the upper 



Im 3- oothed and spreading, the lower cleft into 2 awl-shaped ciliate lobes. 



Corolla not strongly 2-lippod, the upper lip resembling the 3 lob& of the lower 

 ■,» oili^TTSn??'''^^^""^'"'"?'^'^- Stamens mostly protruding. 

 IS. bAlUKhlA. Calyx bell-shaped, naked in the throat, 10-uerved, equally 



B-toothed. Corolla with lower lip of 3 nearly equal entire lobes. Stamens 



somewhat ascending. Leaves narrow. 



$ 4. Stamens 4 (.the lower or miter pair linger), ascending or curved and with the 



plainln -i-celUd (iiilhers approximate oc cimniving in'pairs under the erect and 



Jtattish but not arched vpper lip. Calyx more or less 2-lipped. 



19. CALA3IINTHA. Calyx not flattened. Corolla straight, with inflated throat, 



•and 2-!ipped border, the spreading lower Up .S-parted; its middle lobe entire 



or slightly notched. 



