LABIATJE. (MINT FAMILY.) 359 



30. LEONURUS, L. Motherwort. 



Calyx top-shaped, 5-ncrved, with 5 nearly equal teeth which are awl-shaped, 

 and when old rather spiny-pointed and spreading. Upper lip of the corolla ob- 

 long- anil entire, somewhat arched ; the lower spreading-, 3-lobed ; its middle lobe 

 larger, broad and inversely heart-shaped, the lateral ones oblong. Stamens 4, 

 ascending under the upper lip : anthers approximate in pairs, the valves naked. 

 Nutlets truncate and sharply 3-angled. — Upright herbs, with cut-lobed leaves, 

 and close whorls of flowers in their axils ; in summer. (Name from \ia>v, a lion, 

 and ovpu, tail, i. e. Lion's-tail.) 



1. L. Cardiaca, L. (Common Motherwort.) Tall perennial; leaves 

 long-petioled ; the lower rounded, palmately lobed ; the floral wedge-shaped at 

 the base, 3-cleft, the lobes lanceolate ; upper lip of the pale purple corolla bearded. 



— Waste places, around dwellings. (Nat. from Eu.) 



2. L. Marruriastrum, L. Tall biennial, with elongated branches ;• stem- 

 leaves oblong-ovate, coarsely toothed; corolla (whitish) shorter than the calyx- 

 teeth ; the tube naked within ; lower lip rather erect. — lioadsides, Pennsyl- 

 vania : rare. (Adv. from Eu.) 



31. LAMIUM, L. Dead-Nettle. 



Calyx tubular-bell-shaped, about 5-nerved, with 5 nearly equal awl-pointed 

 teeth. Corolla dilated at the throat ; the upper lip ovate or oblong, arched, nar- 

 rowed at the base; the middle lobe of the spreading lower lip broad, notched 

 at the apex, contracted as if stalked at the base ; the lateral ones small, at the 

 margin of the throat. Stamens 4, ascending under the upper lip : anthers ap- 

 proximate in pairs, 2-celled, the cells divergent. Nutlets truncate at the apex. 



— Herbs, decumbent at the base, the lowest leaves small and long-petioled, the 

 middle ones heart-shaped and doubly toothed, the floral subtending the whorled 

 clusters of flowers ; produced from spring to autumn. (Name from Aai/ior, the 

 throat, in allusion to the ringent corolla.) 



* Annuals or biennials, low: flowers small, purple, in feu) whorls or heads. 



1. L. amplexicaule, L. Leaves rounded, deeply crenate-toothed or cut, 

 the upper ones clasping; corolla elongated, upper lip bearded, the lower spotted; 

 lateral lobes truncate. — Cultivated grounds. (Adv. from Eu.) 



2. L. purpureum, L. Leaves roundish or oblong, heart-shaped, crenate- 

 toothed, all petioled. — Cult, grounds, Pennsylvania. (Adv. from Eu.) 



* * Perennial, taller : flowers larger, in several axillary ivhorls. 



3. L. Album, L. Hairy; leaves ovate, heart-shaped, petioled ; calyx-teeth 

 very slender, spreading; corolla white, the tube curved upwards, obliquely con- 

 tracted near the base, where there is a ring of hairs inside ; lateral lobes of lower 

 lip bearing a long slender tooth. — Waste ground near Boston, D. Murray. 

 (Adv. from Eu.) 



32. BALLOTA, L. Fetid Horehofxd. 



Calyx nearly funnel-form ; the 10-ribbed tube expanded above into a spread- 

 ing regular border, with 5-10 teeth. Anthers exserted beyond the tube of 



