LAMIACEAE 



1017 



or nearly regular. Calyx free, persistent, regular or irregular, often oblique : 

 lobes 5, commonly slender. Corolla gamopetalous, bilabiate, or nearly regular, 

 deciduous. Androecium of 4 didynamous stamens (one of the pairs sometimes 

 wanting or abortive) adnate to the corolla tube, variable in position. Filaments 

 naked or bearded. Anthers 2-celled. Gynoecium compound. Ovary free, 

 deeply 4-lobed, 4-celled. Styles central, united, arising from between the lobes. 

 Stigma terminal, often inconspicuous. Ovules solitary, erect. Fruit usually of 

 4 small nutlets or achenes, included in the persistent calyx. Seed solitary, erect. 

 Endosperm fleshy or wanting. Embryo straight. [Labiatae B. Juss.] 



Ovary of 4 united carpels, 4-lobed : style not basal : nutlets laterally attached. 

 fc J^Corolla very irregular : limb nearly 1-lipped, the upper lip very short. 



Flowers in congested cymes axillary to small bracts, disposed in a raceme- 

 like panicle : calyx-lobes shorter than the tube. 1. TEUCRIUM. 

 Flowers solitary in the axils of bracts nearly similar to the leaves : calyx- 

 lobes longer than the tube. 2. MELOSMON. 

 Corolla nearly regular. 



Stamens only slightly exserted, nearly equal. 3. ISANTHUS. 



Stamens conspicuously exserted, strongly didynamous. 4. TRICHOSTEMA. 



Ovary of 4 distinct or nearly distinct carpels : style basal : nutlets basally attached. 



Calyx with a crest on the upper side or upper lip ; lips 2, entire. 5. SCUTELLARIA. 



Calyx without a crest on the upper side : lips not entire. 



Stamens included. 6. MARRUBIUM. 



Stamens exserted (except in Dicerandra odoratissima) . 



Corolla conspicuously 2-lipped : lips different, the upper concave. 

 Anther-bearing stamens 4. 



Upper pair of filaments longer than the lower. 

 Anther-sacs parallel or nearly so. 



Upper pair of stamens declined, lower pair ascending: erect 



herbs. 7. AGASTACHE. 



Upper and lower pair of stamens ascending : trailing herbs. 8. MEEHANIA. 

 Anther-sacs diverging. 



Calyx barely 2-lipped, with 5 nearly equal lobes : erect herbs. 9. NEPETA. 

 Calyx 2-lipped. with unequal lobes: trailing herbs. 10. GLECOMA. 



Upper pair of filaments shorter than the lower. 

 Calyx manifestly 2-lipped. 



Upper lip of the calyx broad, with 3 lobes, the lower with 2 



tooth-like lobes.* 

 Anther-sacs divaricate : flowers 3 together, or 6 in a whorl : 



calyx dorsally flattened. 11. PRUNELLA. 



Anther-sacs parallel : flowers solitary, or 2 in a whorl : 



calyx somewhat inflated. 12. BRAZORIA. 



Upper lip of the calyx narrow, entire, the lower lip of 2 equal 



broad lobes. 13. MACBRIDEA. 



Calyx not 2-lipped, often slightly irregular, but the lobes essen- 

 tially similar. 

 Tube of the calyx faintly nerved, inflated at maturity. 



Calyx-lobes 5. 14. PHYSOSTEGIA. 



Calyx-lobes 4. 15. SYNANDRA. 



Tube of the calyx prominently 5-10-nerved, not inflated at 



maturity. 



Anther-sacs transversely 2-valved. 16. GALEOPSIS. 



Anther-sacs not transversely 2-valved. 

 Nutlets 3-sided, truncate above. 



Calyx-lobes not spine-tipped. 17. LAMIUM. 



Calyx-lobes spine-tipped. 



Calyx-lobes 5. 18. LEONURUS. 



Calyx-lobes 8-10. 19. LEONOTIS. 



Nutlets nearly terete, rounded above. 20. STACHYS. 



Anther-bearing stamens 2. 

 ..Connective of the anther elongated, bearing a perfect sac at one end 



and a rudimentary one at the other. 



Calyx-throat glabrous or merely ciliate at the base of the lobes. 21. SALVIA. 

 Calyx-throat densely bearded with white hairs and closed by 



them at maturity. 22. SALVIASTRUM. 



Connective short : anther-sacs confluent. 



Calyx not 2-lipped ; tube 15-ribbed ; teeth nearly equal. 23. MONARDA. 



Calyx 2-lipped ; tube 13- ribbed ; teeth unequal. 24. BLEPHILIA. 



Corolla nearly regular or if 2-lipped, the upper lip flat or not concave. 

 A. Stamens 2-4 : filaments straight and spreading or converging under 



the upper lip of the corolla. 

 Flowers in axillary whorls or clusters ; these sometimes forming 



terminal spike-like racemes or panicles. 

 * Corolla 2-lipped. 



f Filaments curved, converging under the upper lip of the 



corolla. 

 Anther-bearing stamens 2. 



Calyx gibbous ; throat closed by hairs : corolla without 



folds in the throat. 25. HEDEOMA. 



Calyx not gibbous ; throat not closed by hairs : corolla 



with 2 folds in the throat. 26. STACHYDEOMA. 



Anther-bearing stamens 4. 

 Corolla-tube strongly bent. 



Anther-sacs divergent. 27. MELISSA. 



Anther-sacs parallel. 28. CONRADINA. 



Corolla-tube straight. 



Calyx with 5 nearly equal lobes, not 2-lipped. 



