400 THE KINDS OF PLANTS 



CC. GAMOPETALM. 



XXXIII. LABIATE. Mint Family. 



Herbs, usually of aromatic scent, with 4-cornered stems and oppo- 

 site usually simple leaves: flowers typically 2-lipped; stamens 4 

 in 2 pairs, or only 2; ovary deeply 4-lobed, forming 4 indehiscent 

 nutlets in fruit. A well-marked family of some 2,700 species, dis- 

 tributed in about 150 genera, of both temperate and tropical regions. 

 To this family belongs the various mints, as peppermint, spearmint, 

 catnip, hyssop, thyme, pennyroyal, savory, rosemary, sage, hore- 

 hound, balm, basil. Flowers mostly in whorls in the axils of leaves or 

 bracts, sometimes forming interrupted spikes. 



a. Stamens 2. 



b. Calyx nearly equally toothed. 



c. Lobes 5: throat hairy 1. Monarda 



cc. Lobes 4-5: throat naked 2. Lycopus 



bb. Calyx 2-lipped. 



c. Throat naked within 3. Salvia 



cc. Throat hairy: plants very pungent-scented 4. Hedeoma 



aa. Stamens 4. 



b. Corolla scarcely 2-lipped: lobes nearly equal. 



c. Border of corolla 44obed: upper lobe broadest and 



emarginate 5. Mentha 



cc. Border of corolla 4-lobed, with a deep fissure be- 

 tween the 2 upper lobes 6. Teucrium 



bb. Corolla strongly 2-lipped. 

 c. Calyx 2-lipped. 



d. Lips of calyx toothed: flowers in dense terminal 



spikes or heads 7. Prunella 



dd. Lips of calyx entire, the upper humped, or 

 appendaged: flowers axillary in bracts or leaf 



axils, solitary or racemed 8. Scutellaria 



cc. Calyx nearly or quite regular. 



D. Upper pair of the stamens the longer 9. Nepeta 



dd. Upper pair of the stamens the shorter. 



E. Stamens' short, included in the tube of the 



corolla 10. Marrubium 



ee. Stamens long, projecting from the corolla-tube. 11. Leonurus 



1. MONARDA. Horse-mint. 



Rather stout, mostly perennials, with flowers in close terminal heads: 

 calyx tubular, 15-nerved, hairy in the throat, the teeth nearly equal: corolla 

 strongly 2-lipped, the upper lip erect, the lower spreading and 3-lobed. 



M. fistulosa, Linn. Two to 5 ft., in clumps: leaves ovate-lanceolate: 



