388 LABIAT.E. (MINT FAMILY.) 



lateral lobes truncate ; anthers hairy. Cultivated ground and waste places, 

 common. May. (Y) Stems 4'- 12' high. Corolla small, purple, often im- 

 perfectly developed. 



27. MARRUBIUM, L. HOREHOUND. 



Calyx tubular, 5- 10-iierved, nearly equally 5- 10-toothed, the teeth spiny, 

 mostly spreading in fruit. Corolla-tube included in the calyx, 2-lipped ; the 

 upper lip erect ; the lower 3-lobed, with the middle lobe largest. Stamens 4, 

 included : anther cells diverging. Lobes of the style short, obtuse. Nutlets 

 obtuse at the apex. Chiefly tomentose or woolly perennial herbs, with 

 rugose leaves, and axillary whorls. 



1- M. VUlgare, L. Woolly; stems branching at the base, ascending; 

 leaves petioled, ovate or roundish, crenate, the floral ones smaller, but longer 

 than the capitate many-flowered whorls; calyx teeth 10, recurved-spreading ; 

 corolla small, white. Waste ground and roadsides. Introduced. Stems 

 l-2high. 



28. LEONOTIS, R. BROWN. 



Calyx tubular, 10-nerved, incurved, unequally 8 - 1 0-toothed ; the teeth 

 straight, spiny, the upper one largest. Corolla slender, 2-lipped ; the upper 

 Up long, arching, entire, the lower very short, 3-cleft, spreading. Stamens 4, 

 ascending under the upper lip : anther cells diverging. Nutlets 3-augled, 

 truncate. Tall herbs, with very large globose whorls in the axils of the 

 upper leaves. Flowers yellow or scarlet. 



1. L. nepetsefolia, R. Br. Annual; stem tomentose, simple or 

 branched ; leaves remote, long-petioled, broadly ovate, crenate, the floral 

 ones lanceolate ; whorls 1 to several ; calyx 8-toothed ; corolla villous, scarlet. 

 Waste grounds, Georgia and Florida. June - August. Introduced. 

 Stem 1 - 6 high. Whorls 1' - 2' in diameter. Corolla 1' long. 



29. LEONURUS, L. MOTHERWORT. 



Calyx top-shaped, 5-nerved, 5-toothed, the teeth spiny and at length spread- 

 ing. Corolla 2-lipped ; the upper lip entire, the lower spreading, 3-lobed, with 

 the middle lobe obcordate. Stamens 4, ascending : anther cells parallel, naked. 

 Nutlets 3-augled, truncate. Herbs, with iucisely lobed leaves ; the floral ones 

 longer than the dense whorls. Bracts subulate. 



1. L. Cardiaca, L. Stem (2-4 high) square, pubescent; leaves long- 

 petioled, the lower ones round-cordate, palmately lobed and toothed ; the 

 floral wedge shaped, 3-cleft toward the apex ; whorls distant, 6 - 15-flowered ; 

 corolla villous, purplish, spotted with brown in the throat. Waste places. 

 Introduced. June - July. 



30. STACHYS, L. HEDGE NETTLE. 



Calyx tubular bell-shaped, 5- or 10-nerved, 5-toothed ; the teeth equal, or 

 the upper one larger, more or less spine-pointed (in our species), spreading in 

 fruit. Corolla hairy within, 2-lipped ; the upper lip erect, the lower spread- 

 ing, 3-lobed, with the middle lobe much larger. Stamens 4, ascending : an- 



