LABIATAE. 307 



axillary clusters; leaves all 



alike. 432. Glechoma, 311. 



Upper pair of stamens shorter than 

 the lower. 

 Calyx bilabiate. 433. Prunella, 311. 



Calyx not bilabiate. 



Teeth of the calyx 10. 434. Marrubium, 311. 



Teeth of the calyx 5. 



Calyx teeth spiny. 435. Leonurus, 312. 



Calyx teeth not spiny. 



Flowers opposite; calyx 



becoming inflated. 436. Physostegia, 312. - 

 Flowers whorled; calyx 

 not becoming in- 

 flated. 

 Throat of the cor- 

 olla dilated. 437. Lamium, 312. 

 Throat of the cor- 

 olla not dilated. 438. Stachys, 313. 



424. TRICHOSTEMA. 



Low annual branched herbs or somewhat woody plants; 

 leaves entire; calyx bell-shaped, oblique, deeply 5-cleft, the 3 

 upper teeth elongated and partly united, the 2 lower very short; 

 corolla small, almost equally 5-parted, the 3 lower lobes more or 

 less united; stamens 4, much exserted; anther-cells divergent 

 and at length confluent. 



Corolla tube not exceeding the calyx; leaves membranaceous, 



costate-veined. T. ohloiigum. 



Corolla tube slender, exserted; leaves crowded, strongly 3- 



5-nervose. . T. lanceolatiim. 



Trichostema oblongum Benth. Annual, erect, branched, 10-30 cm. high, 

 the stem soft-hairy; leaves oblong or oval, acute, entire, 1-3 cm. long, canes- 

 cently pubescent, narrowed at base, short petioled; flowers in nearly sessile 

 axillary dense cymes; pedicels short; calyx campanulate, hairy, equally 

 5-cleft, the narrow lobes much longer than the teeth, equalling the corolla- 

 tube; corolla violet. 



In mo'st open places, first collected at Fort Vancouver, Washington, by 

 Douglas. Odor strong but not unpleasant. 



Trichostema lanceolatum Benth. Blueciirls. Densely ashy-pubescent; 

 stems simple or more often branched from the base, erect, 10-30 cm. high; leaves 

 numerous, lanceolate, sessile or nearly so, attenuate to an acute apex; flowers 

 in dense axillary nearly sessile clusters; calyx-lobes ovate, acute, longer than 

 the tube; corolla blue, very slender, 12 mm. long. 



From the Columbia River to California in dry ground. The original 

 specimens of Douglas are said to have been collected at F~ort Vancouver, 

 Washington. 



425. LYCOPUS. 



Low perennial herbs, glabrous or puberulent, not aromatic; 

 leaves sharply-toothed or pinnatifid; flowers small, mostly white, 

 in dense axillary whorls; calyx bell-shaped, nearly equally 4- or 5- 



