LXXV. LABIATE 
883 
Filaments naked. 
Calyx 5-labed ; lobes linear, elongated and feathery 
in fruit ...... 
Calyx 5-toothed, bell-shaped. 
Flowers white, purple or yellow. 
equal pairs 
Flowers lilac. Stamens all equal . 
Corolla 5-lobed. * 
Flowers pale purple, in terminal heads. 
Stamens in un 
Flowers white, in racemes . 
6. Colebrookea. 
7. Elsholtzia. 
9. Mentha. 
1. Acrocephalus. 
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. 
Filaments united near the base. Flowers f-1 in. long . 3. 
* * Lower lip of corolla distinctly 3-lobed. 2 
f 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 i in. long 20. 
Flowers \ 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 null 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. 
Pledranthus. 
Coleus. 
Origanum. 
Ajuga. 
Hicromeria . 
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. 
