Labiatae. 109 



VERBE'NA OFFICINA'LIS {67). Vervain. 7—9. Stem 1—2 ft. 

 (iioi) high, 4-angled, 'leaves opposite pinnatifid or tri-partite, flowers lilac 

 in long dense spikes. Drj/ waste ground. 



ORDER 53. — Labiatae. 



Calyx gamosepalous of 5 sepals. Corolla gamopetalous 2-lipped. Stamens 

 didynamous epipetalous. Pistil syncarpous superior. Ovary deeply 4-lobed, 

 style basilar. Stem 4-angled. Leaves opposite, flowers in whorls. 



Stamens 2, 437 



Stamens 4, 438 



437 Calyx 2-lipped, ....... Salvia XIV. 



437 Calyx 5-toothed, Lycopus I. 



438 Stamens 2 much longer than the other 2, 439 



438 Stamens nearly equal in length, 441 



439 Calyx equally toothed, 440 



439 Calyx 2-lipped, 443 



440 Calyx lo-toothed, . . . , , Marrubium VIII. 



440 Calyx 5-toothed, 442 



441 Corolla nearly regular, Mentha II. 



441 Corolla 2-lipped, 445 



442 Upper lip of corolla minute, 446 



442 Upper lip of corolla longer than stamens, 447 



443 Lips of calyx entire, Scutellaria XVII 



443 Upper lip of calyx trifid, lower bifid, 444 



444 Calyx campanulate 4 or 5-toothed, . . Melittis IX. 



444 Upper lip of calyx trifid, lower bifid, 448 



445 Procumbent, calyx 2-lipped, Thymus III. 



445 Erect, calyx 5-toothed, Origanum IV. 



446 Upper lip of corolla deeply bifid, . . . Teucrium VI. 



446 Upper lip of corolla entire or only slightly notched, . Ajuga VII. 

 447 Lower lip of corolla entire with one or two small 



teeth at each side Lamium XL 



447 Lower lip of corolla trifid, 449 



448 Stamens parallel, ...... Prunella XVI . 



448 Stamens remote at base conniving under 



the upper lip, . .... Calamintha V. 



449 Upper or inner stamens the longest, .... Nepeta XV. 



449 Lower or outer stamens the longest 450 



