LXXV. LABIATE 
383 
Filaments naked. 
Calyx 5-lobed ; lobes linear, elongated and feathery 
in fruit ........ 6. Colebrookea . 
Calyx 5-toothed, bell-shaped. 
Flowers white, purple or yellow. Stamens in un- 
equal pairs ....... 7. Elsholtzia . 
Flowers lilac. Stamens all equal ... 9. Mentha. 
Corolla 5-lobed. 
Flowers pale purple, in terminal heads ... 1. Acrocephalus. 
Flowers white, in racemes ..... 8. Perilla. 
B. Corolla irregular, limb 2-lipped. 1 
I. Stamens 2. 
Filaments very short, anther- cells widely separated . .16. Salvia 
II. Stamens 4. 
* Lower lip of corolla boat -shaped, entire. 
Filaments free. Flowers about £ in. long ... 2. Plectranthus. 
Filaments united near the base. Flowers f-1 in. long . 3. Coleus. 
* * Lower lip of corolla distinctly 3-lobed. 2 
| Calyx not 2 -lipped, teeth equal or nearly so. 
Upper lip of corolla flat or nearly so. 1 
Leaves 1 in. or more long. 
Flowers pink, in short spikes . . . .11. 
Flowers blue or lilac, in axillary whorls . . 29. 
Leaves J in. long. Whorls axillary, 1-4-flowered 13. 
Upper lip of corolla concave or hood-like. 
Inner or upper pair of stamens longer than the outer . 17. 
Outer or lower pair of stamens longer than the inner . 
Flowers about J in. long . . . . .20. 
Flowers i in. or more long. 
Calyx 10-toothed ...... 26. 
Calyx 5-toothed or lobed. 
Leaves deeply lobed . . . . . 23. 
Leaves undivided. 
Calyx nearly as long as the corolla . .25. 
Calyx not longer than the corolla-tube. 
Flowers white except mid-lobe of lower lip. 21. 
Flowers pink, spotted with purple . . 22. 
Flowers dull blue-purple . . .27. 
t t Calyx 2-lipped. 
Calyx-mouth remaining open after flowering. 3 
Leaves ^ in. long ....... 12. 
Leaves f in. or more long ..... 14. 
Calyx-mouth closing after flowering. 
Calyx-lips entire . . . . . . .18. 
Calyx -lips toothed or lobed . . . . .19. 
Origanum 
Ajuga. 
Micromeria. 
Nepeta. 
Craniotome. 
Leucas. 
Leonurus. 
Roylea. 
Anisomeles. 
Stachys. 
Phlomis. 
Thymus. 
Calamintha. 
Scutellaria. 
Brunella. 
1 Upper lip very short in Ajuga. 2 Middle lobe often notched. 3 In 
Thymus the mouth of the calyx is closed by hairs. 
