78 LABIATE. LEONURrs. 



1. Leonurus Cardiaca, Linn. Common Motherwort. 



Lower stem-leaves palmately lobed ; the upper ovate, lobed ; floral ones 3-cleft, narrowed 



at the base ; the lobes lanceolate ; tube of the corolla with a villous ring inside ; upper lip 



flatlish ; middle lobe of the lower lip entire. — Linn. sp. 2. p. 584 ; Engl. hot. t. 410 ; Pursk, 



Jl. 2. p. 408 ; Ell. sk. 2 p. 77 ; Bigel. fl. Bost. p. 235 ; Beck, hot. p. 278 ; Benth. Lab. 



p. 518 ; Darlingt. fl. Cest. p. 358. 



Perennial. Stem 2-3 feet high, branching ; the angles pubescent. Leaves on long 

 petioles, spreading or somewhat pendulous, dull green above, pale and pubescent underneath. 

 Whorls numerous. Calyx with sharp rigid spreading teeth. Corolla small, reddish white ; 

 the upper lip pubescent. 



Waste places and about walls ; common. Introduced from Europe. July - August. 

 Formerly a medicine of some repute, but now neglected. 



21. MARRUBIUM. Linn. ; Benth. Lab. p. 585. HOREHOUND. 



[ Supposed to have been named from a town in Italy.] 



Calyx tubular, 5 - 10-nerved, with 5-10 nearly equal erect or finally spreading teeth. 

 Corolla 2-lipped : upper lip erect, flattish or concave, entire or slightly 2-cleft ; lower lip 

 spreading, 3-lobed ; the middle lobe broader, and often emarginate. Stamens 4 ; the lower 

 pair longer, included within the tube of the corolla : anther-cells divaricate and somewhat 

 confluent. — Perennial herbs, mostly woolly, with rugose and often incised leaves. Whorls 

 many- or few-flowered. 



1. Marrubium vulgare, Linn. Common Horehound. 



Stem ascending, hoary-tomentose ; leaves roundish-ovate, toothed-crenate ; whorls many- 

 flowered ; calyx with 10 subulate recurved teeth. ^- Linn. sp. 2. p. 583 ; Engl. bot. t. 410 ; 

 Pursh, fl. 2. p. 408 ; Ell. sk. 2. p. 76 ; Beck, bot. p. 280 ; Benth. Lab. p. 591 ; Darlingt. 

 fl. Cest. p. 360. 



Plant white and woolly. Stems numerous, 12 - 18 inches high. Leaves petiolate, very 

 rugose, about two inches long, narrowed at the base. Flowers in distant compact whorls. 

 Calyx 10-neivcd. Corolla small, white, pubescent. 



Stony banks of rivers, and about houses : introduced from Europe. July - August. A 

 popular medicine, in very general use for colds, and as a mild tonic. It is now much em- 

 ployed as an ingredient of certain candies. 



