Physostegia. LABIATiE. 77 



fourths of an incli long, pale purple or sometimes variegated ; the tube much dilated : upper 

 lip nearly entire ; lobes of the lower lip slightly emarginate. Stamens a little longer than the 

 lube of the corolla ; anther-cells distinct ; the margins spinuJose-denticulale toward the base. 

 Achenia with a small abrupt point. 



i9. LAMIUM. Linn.; Benth. Lab. p. 507. DEAD-NETTLE. 



[ Namoil from the Greek, laimos, the throat ; on account of tlie shape of the flower.] 



Calyx tubular-campanulate, about 5-nerved ; the mouth equal, or often oblique, with 5 nearly 

 equal subulately pointed teeth. Corolla 2-lipped : upper lip ovate or oblong, galeate or 

 arched, usually narrowed at the base ; the throat dilated : lateral lobes at the margin of the 

 throat truncate or rarely oblong, sometimes with a tooth-like process ; middle lobe broad 

 and emarginate, contracted at the base and somewhat stipitate. Stamens 4 ; the lower pair 

 longer : anthers approximated by pairs. — Herbs (often annual), with the stems assurgent. 

 Lower leaves on long petioles ; upper ones larger, and often cordate at the base, incisely 

 toothed or crenate. Flowers in whorls ; the lower ones remote. 



1. Lamium amplexicaule, Linn. Common Dead-nettle. Hen-hit. 



Leaves orbicular, crenately incised , the lower ones petioled, upper ones clasping ; tube of 

 the corolla naked within , the throat dilated ; upper lip oblong, entire ; anthers hairy. — Linn, 

 sjp. 2. p. 579 ; Engl. hot. t. 770 ; rursh, fl. 2. p. 206 , Ell. sk. 2. p. 73 ; Bigel. fl. Bost. 

 p. 235 ; Beck, hot. p. 278 ; Benth. Lab. p. 511 ; Darlingt. fl. Cest. p. 357. 



Annual. Stems much branching from the base, 6-10 inches high. Lower leaves about 

 half an inch long, and of rather greater breadth ; the petioles usually longer than the lamina : 

 floral leaves larger, closely sessile. Whorls many-flowered ; the upper ones approximated. 

 Calyx hairy. Corolla nearly half an inch long, bright purple, pubescent ; the uj)pcr lip 

 densely villous : throat and lower lip spotted. 



Fields and cultivated grounds ; very common. Introduced from Europe. April - November. 



20. LEONURUS. Linn. ; Benth. Lab. p. 517. MOTHERWORT. 



[ From the Greek, kon, a lion, and oiira, a tail ; from a fancied resemblance of the plant.] 



Calyx turbinate, 5-nerved, with five nearly equal teeth, which are subulate, with somewhat 

 spiny tips, and finally spreading. Corolla 2-lipped ; the upper lip oblong and entire, cither 

 flattish or vaulted ; lower lip spreading, 3-lobed : lateral lobes oblong ; middle one obcordate. 

 Stamens ascending ; the lower pair longer. Anthers approximated by pairs. — Erect herbs, 

 with incisely lobed leaves, and the flowers in dense whorls. 



