LAMIACEAE. 



323 



3. LAMIUM [Tourn.] L. 

 Mostly diffuse herbs, with creiiate dentate or incised, usually cordate 

 leaves, and rather small flowers, verticillate in axillary and terminal clusters. 

 Calyx tubular-campanulate, about 5-nerved, 5-toothed, the teeth equal or the 

 upper ones longer. Corolla-limb 2-lipped; upper lip concave, erect, usually 

 entire; lower lip spreading, 3-cleft, the middle lobe emarginate, contracted at 

 the base. Anthers 2-celled, the sacs divaricate, often hirsute on the back. 

 [Greek, throat, from the ringent corolla.] About 40 species, of the Old 

 World. Type species: Lamium purpureum L. 



1. Lamium amplexicaule 



L. Henbit. (Fig. 346.) Bi- 

 ennial or annual, sparingly 

 pubescent; stems weak, slen- 

 der, ascending or decumbent, 

 6'-20' long. Leaves orbicular 

 or nearly so, coarsely crenate, 

 i'-lV wide, rounded at the 

 apex, the lower slender-petioled ; 

 flowers in axillary and terminal 

 clusters; calyx pubescent, its 

 teeth erect, nearly as long as 

 the tube; corolla purplish or 

 red, 6"-8" long, its tube very 

 slender, the lateral lobes of its 

 lower lip very small. [Glecoma 

 hederacea of Millspaugh.] 



Common in waste and culti- 

 vated grounds. Naturalized. Na- 

 tive of Europe. Widely natural- 

 ized in North America. Flowers 

 nearly throughout the year. 



Lamium purpureum L., Eed Dead-Nettle, also European, has all the 

 leaves petioled and nearly erect, stouter stems, the similar flowers red-purple, 

 Lefroy says it was a common weed at his time, and Eeade records it as found 

 on waysides and in cultivated grounds prior to 1883, but it has not been 

 observed by recent collectors. H. B. Small's record would indicate that he 

 had a purple-flowered plant of the preceding species in mind. 



4. LEONURUS L. 

 Tall herbs, with palmately cleft, parted or dentate leaves, and small white 

 or pink flowers verticillate in dense axillary clusters. Calyx tubular-campanu- 

 late, 5-nerved, nearly regular and equally 5-toothed, the teeth rigid, subulate 

 or aristate. Corolla-limb 2-lipped; upper lip erect, entire; lower lip spread- 

 ing or deflexed, 3-lobed, the middle lobe broad, obcordate or emarginate. 

 Anthers 2-celled, the sacs mostly parallel. Nutlets 3-sided, smooth. [Greek, 

 lion's-tail.] About 10 species, of Europe and Asia. Type species: Leonurus 

 Cardiaca L. 



