PHYSOSTEGIA LABIAT^E 557 



MARRUBIUM 



larged upward; upper lip concave, rounded, entire ; the lower one 

 spreading, 3-lobed, the middle lobe commonly emarginate. Sta- 

 mens 4, ascending under the upper lip of the corolla, the lower 

 pair the longest ; filaments pubescent; anthers all alike, 2-celled, 

 the cells nearly parallel, the margins of their valves commonly 

 spinulose or denticulate. Nutlets ovoid-triquetrous, smooth. 



* P. parviflora Nutt. Benth. in DC. Prodr. xii, 437 as synonym. 

 Glabrous: stems rather stout, 1-3 feet high, simple, or branched above: 

 leaves mostly lanceolate, acute, or the lower ones obtuse, at the apex, 

 sharply serrate, somewhat narrowed at base, all sessile or the lowest 

 petioled, 3-4 inches long, 3-10 lines wide : spikes several many-flowered, 

 1-4 inches long: bracts ovate or ovate- lanceolate, acute, shorter than the 

 calyx: calyx in flower campanulate, 2 lines long, its teeth ovate, obtuse or 

 acutish, becoming globose-oblong in fruit : corolla purple, 6 lines long. 

 In moist meadows, northwestern Oregon to Brit. Columbia and Minnesota. 



18 MARRUBIUM L. Sp. 582. 



Perennial herbs with petioled dentate leaves and small flowers 

 in dense axillary clusters. Calyx tubular, 5-10-nerved, regularly 

 5-10-toothed, the teeth nearly equal, or the alternate ones short- 

 er, acute or acutish, spreading or recurved in fruit. Corolla 

 bilabiate, the upper lip erect, entire or emarginate, the lower 

 spreading, 2-cleft, its broader middle lobe commonly emarginate. 

 Stamens 4, included, the posterior pair the shorter. Anthers 2- 

 celled, the cells divergent. Nutlets ovoid, smooth. 



M. VDLGARE L. Sp. 583. (WHITE HOARHOUND.) Stems erect, stout, 

 1-3 feet high, white-woolly, much branched, the branches ascending : 

 leaves oval or broadly ovate to nearly orbicular, rugose-veined, obtuse at 

 the apex, crenate-dentate, rounded, 'narrowed or subcordate at base, 1-2 

 inches long, rough, whitish above, woolly beneath, on petioles 6-12 lines 

 long: flowers in dense many-flowered axillary clusters : calyx-teeth usually 

 10, glabrous above, woolly below subulate, more or less recurved : corolla 

 white, 3-4 lines long. In waste places : naturalized from Europe. 



19 LEONURUS L. Sp. 584. 



Tall perennial herbs with palmately cleft, parted or dentate 

 leaves and small white or pink flowers in dense verticillate axil- 

 lary clusters. Calyx tubular-campanulate, 5-nerved, nearly reg- 

 ular and equally 5-toothed, the teeth rigid, subulate or aristate. 

 Corolla bilabiate: upper lip erect, concave or nearly flat, entire: 

 lower lip spreading, or deflexed, 3-lobed, the middle lobe broad, 

 obcordate or emarginate. Stamens 4, the anterior pair longest: 

 anthers 2-celled, the cells mostly parallel. Nutlets 3-sided, smooth. 



L. CARDIACA L. Sp. 584. Puberulent perennial : stems rather stout, 

 strict, commonly branched, 2-5 feet high, the branches straight and as- 

 cending: leaves membranaceous, the lower nearly orbicular, palmately 

 3-5- cleft, 2-4 inches broad, the lobes acuminate, incised or dentate, upper 

 narrowly oblong-lanceolate or rhombic, 3-cleftor the upper merely 3-tooth- 

 ed, all -s'lender-petioled, canescently puberulent beneath, green above: 

 flowers in dense glomerate clusters in the axils of the upper leaves, shorter 

 than the petioles: calyx glabrous, about 3 lines long, its teeth lanceolate- 

 subulate, somewhat spreading, nearly as long as the tube : corolla pink, 

 purple or white, 3-5 lines long, its tube with an oblique ring of hairs with- 



