LABIATE. 281 



Barren fields and woods. Arct. Amer. to N. Y. W. to Miss. May — Aug. ®.— 

 Nearly smooth. Stem 8 — 15 inches high, obtusely 4-angled. Flowers pale-blue, 

 in ovoid or globose spikes which are about an inch in diameter. 



SmaU-fiowered Dragon's Head. 



VII. STACHTDE.E. Colyx 5 — 10-nerved or irregularly veined. Co- 

 rolla 2-lipped. Stamens 4, ascending ; the lower pair longer. Achenia 

 smoothish when dry. 



20. PHYSOSTEGIA, Benth.—-physostegm. 



(From the Greek <pvsa, a bladder, and ariyrt, a covering ; in allusion to its 

 Inflated calyx.) 



Calyx 5 -toothed or truncate, at length inflated-campanulate. 

 Corolla 2-lipped ; tube exserted, destitute of a ring within ; up- 

 per lip nearly erect, somewhat concave ; loWer with 3 rounded 

 lobes, the middle one larger and emarginate. Stamens 4, 

 ascending under the upper lip ; the lower pair rather longer. 



P. Virginiana Benth. : calyx acutely and almost equally 5-toothed. 

 Dracocephalum Virginiayium Linn, and D. denticulatmn Alt, D. vari- 

 egatum Vent. 



Low groimds. Can. to Flor. W. to Miss. June — Aug. %. — Stem about 

 2 feet high, smooth except at the summit. Leaves sessile, opposite, varying from 

 narrow-lanceolate to ovate-lanceolate, acutely serrate or denticulate, coriaceous. 

 Flowers large, pale-purple, sometimes variegated, nearly sessile and usually 

 opposite, in long spikes, crowded or somewhat distant. I follow Bentham in 

 uniting the two or three species heretofore considered distinct, but not witliout 

 considerable hesitation. I cannot help thinking, with Dr. Darlington, that 

 D. denticulatum of previous authors will eventually prove to be, if not a distinct 

 species, at least a constant variety. Dragon's Head. 



21. LAMIUM. Lm^i.— Dead Nettle. • 

 (From the Greek Xot/^oj, the throat; on account of the shape of the flower.) 



Calyx tubular-campanulate, about 5-nerved, with 5 nearly 

 equal subulate teeth. Corolla 2-lipped ; upper lip oblong or 

 ovate, galeate ; throat dilated ; lower hp with the middle or 

 lower lobe broad, emarginate, contracted at base. Stamens 4, 

 the lower pair longer. 



L. amplexicaule Linn. : leaves rounded, crenately incised ; lower ones 

 petiolate ; floral sessile, clasping ; tube of the corolla naked within. 



Fields and road-sides. N. S. May— Nov. Q.—Stem 6—10 inches high, 

 branched from the base. Flowers with the tube slender, purple, in dense whorls. 

 Introduced from Europe. Common Dead Nettle. Hen-bit. 



22. LEONURUS. I/wn.— Motherwort. 



(From the Greek Xewj/, a lion, and ovpa, a tail ; on account of a fancied 

 resemblance in the plant.) 



Calyx turbinate, 5-nerved, with 5 subulate equal teeth. 

 Corolla 2-lipped; upper lip very hairy above, entire; lower 



