LABI AT AE (MINT FAMILY) 



16 a Flowers in branching, somewhat leafy panicles 



3. Trichostema. p 205 

 b Flowers in spikes or in clusters in the axils 17 



17 a Corolla nearly regularly 5-lobed ; leaves linear, oblong, 



or lanceolate, usually entire 2. Isanthus. p 205 



b Corolla more or less 2-lipped ; leaves toothed or entire 18 



18 a Corolla 4-lobed, the upper lobe notched, nearly regular; 



plants aromatic 28. Mentha. p 208 



b Corolla 2-lipped, or not completely as in a 19 



19 a Corolla with 4 upper lobes nearly equal, the lower lobe 



much larger; ovary 4-lobed i. Teucrium. P 205 



b Corolla strongly 2-lipped, not completely as in a; ovary 



deeply 4-parted 20 



20 a Flowers i in. or more long in spikes 2-8 in. long; calyx 



faintly nerved 10. Physostegia. p 206 



b Flowers i in. or less long, not completely as in a. ... 21 



21 a Calyx i5-nerved 22 



b Calyx i3-nerved or less 24 



22 a Leaves entire, linear to oblong 22. Hyssopus. p 207 



b Leaves coarsely toothed, usually ovate 23 



23 a Calyx somewhat 2-lipped ; average leaf 2-7 in. long 



6. Agastache. p 206 

 b Calyx nearly regularly 5 -toothed ; average leaf 1-3 in. 



long 7. Nepeta. p 206 



24 a Calyx hairy on the inside, unequally 5-toothed 25 



b Calyx not hairy on the inside 26 



25 a Flowers }4 in. or less long 25. Thymus. p 207 



b Flowers about % in. long 23. Origanum, p 207 



26 a Corolla tube somewhat curved 19. Melissa, p 207 



b Corolla tube straight 27 



27 a Calyx 2-lipped, the tube and pointed teeth with long 



hairs 21. Clinopodium. p 207 



b Calyx more or less regularly 5-toothed 28 



28 a Flowers %-i in. long, 4-10 in a whorl 14. Stachys. p 206 

 b Flowers about ^4 in. or less long 29 



29 a Flowers purple 20. Satureia. p 207 



b Flowers white or purple-spotted 24. Koellia. p 207 



1 TEUCRIUM AMERICAN GERMANDER. (T. canadense.) 



2 ISANTHUS .FALSE PENNYROYAL. (I. brachiatus.) 



3 TRICHOSTfcMA BLUE CURLS. (T. dichotomum.) 



4 SCUTELLARIA. 



i a Flowers solitary or in pairs in the axils of the leaves; 

 flowers about i in. long 



MARSH SKULLCAP. (S. galericulata.) 

 b Flowers in more or less leafy-bracted racemes 2 



205 



