LABIATAE. 31 1 



cordate at base, 2-6 cm. long, petioled, densely canesccnt; spike stout, dense, 

 2-10 cm. long; calyx-teeth subulate, the longest one-half as long as the tube; 

 corolla white or purplish, with dark dots, 10-12 mm. long, its tube exceeding 

 the calyx. 



Introduced in waste places; native of Europe. 



432. GLECHOMA. 



Low diffuse perennial herbs; leaves all alike, nearly orbicular 

 or reniform, crenate, long-petioled ; flowers rather large, blue or 

 violet, solitary or in few-flowered axillary clusters; calyx oblong- 

 tubular, 15-nerved, oblique at the throat, unequally 5-toothed, 

 but not 2-lipped; corolla-tube exserted, enlarged in the throat, 

 2-lipped; upper lip erect 2-lobed or emarginate; lower lip spread 

 ing, 3-lobed; stamens 4, didynamous, all anther-bearing, ascend- 

 ing under the upper corolla-lip; ovary deeply 4-parted; nutlets 

 ovoid, smooth. 



Glechoma hederacea L. Ground Ivy. Pubescent; stems creeping, 15-40 

 cm. long, the branches erect or ascending; leaves numerous, cordate-orbicular, 

 coarsely crenate, 1-4 cm. broad, the petiole as long as or longer than the blades; 

 flowers axillary, solitary or in few-flowered clusters; calyx puberulent, the 

 lobes acute, about one-third as long as the tube; corolla violet, three times as 

 long as the calyx. 



Introduced from Europe. 



433. PRUNELLA. Heal All. 



Low perennials; flowers in terminal or axillary heads or spikes; 

 calyx tubular-bell-shaped, about 10-nerved, 2-lipped, not gibbous 

 on the upper side, closed in fruit; upper lip broad and flat, 

 truncate, with 3 short teeth, the lower 2-cleft; corolla 2-lipped, 

 slightly contracted at the throat and dilated at the lower side 

 just beneath it; upper lip arched, erect, entire, the lower reflexed- 

 spreading, 3-cleft; stamens 4, ascending under the upper lip, the 

 lower pair longer. 



Prunella vulgaris lanceolata (Barton) Fernald. Glabrous or nearly so, 

 erect or ascending, 15-40 cm. high; leaves ovate-oblong or oblong-lanceolate, 

 acute or obtuse, rounded or cuneate at base, entire or crenate, 2-6 cm. long; 

 petioles slender, about half as long as the blades; spikes terminal, very dense, 

 2-5 cm. long; bracts very broad, ovate or orbicular, cuspidate-acuminate, 

 ciliate; calyx-teeth somewhat ciliate; corolla violet, 8-12 mm. long, hardly 

 twice as long as the purplish calyx. 



Moist ground, common; ascends in the Olympic Mountains to about 

 5000 m. altitude. 



434. MARRUBIUM. 



Bitter-aromatic, whitish-woolly perennials, branched at the 

 base; leaves wrinkled; flowers small, much crowded in axillary 

 whorls, calyx tubular, 5-10-nerved, nearly equally 10-toothed, 

 the teeth spiny-pointed; corolla 2-lipped, the upper lip erect, 

 notched, the lower spreading, 3-cleft, the middle lobe broadest; 



