406 LABIAT/E. (MINT FAMILY.) 



2. ISANTHUS, Michx. FALSE PENNYROYAL. 



Calvx bell-shaped, 5-lobed, equal, enlarged in fruit. Corolla little longer 

 than the calyx ; the border bell-shaped, with 5 nearly equal and obovate spread- 

 ing lobes. Stamens 4, slightly didynamous, incurved-asceudiug, scarcely ex- 

 ceeding the corolla. A low, much branched annual, clammy -pubescent, with 

 nearly entire lance-oblong 3-uerved leaves, and small pale blue flowers on 

 axillary 1 - 3-flowered peduncles. (Xame from itros, equal, and &vBos, flower, 

 referring to the almost regular corolla.) 



1. I. caeruleus, Michx. Corolla 2-3" long, little exceeding the calyx. 



Dry or sterile ground, Maine to 111., Minn., and southward. July, August. 



3. TEUCRIUM, Tourn. GERMANDER. 



Calyx 5-toothed. Corolla with the 4 upper lobes nearly equal, oblong, turned 

 forward, so that there seems to be no upper lip ; the lower lobe much larger. 

 Stamens 4, exserted from the deep cleft between the 2 upper lobes of the co- 

 rolla; anther-cells confluent. (Named for Teucer, kiug of Troy.) 



1. T. Canad.en.se, L. (AMERICAN GERMANDER. WOOD SAGE.) Per- 

 ennial, downy, erect (1-3 high) ; leaves ovate-lanceolate, serrate, rounded at 

 base, short-petioled, hoary underneath, the floral scarcely longer than the ob- 

 lique unequally -toothed calyx ; whorls about 6-flowered, crowded in a long and 

 simple wand-like spike; calyx canescent, the 3 upper lobes very obtuse or the 

 middle one acutish; corolla purple, rose, or sometimes cream-color (6" long). 



Low grounds ; not rare. July -Sept. 



2. T. OCCidentale, Gray. Loosdy pubescent; calyx viUons with viscid 

 hairs, the upper lobes acute or middle one acuminate; corolla 4-5'' long; other- 

 wise like the last. A western form, from Neb. south westward, and extending 

 eastward (Out., and near Philadelphia). 



4. AJTJGA, L. 



Calyx 5-toothed. Corolla with very short and as if truncate upper lip ; the 

 large and spreading lower lip with the middle lobe emarginate or 2-cleft. Sta- 

 mens as in Teucrium, but anther-cells less confluent. (From o- privative, and 

 uyov (Latin juynw), yoke, from the seeming absence of a yoke-fellow to the 

 lower lip of the corolla.) 



A. REPTANS, L. Perennial, about 1 high, with copious creeping stolons ; 

 leaves obovate or spatulate, sometimes sinuate, the cauline sessile, the floral 

 approximate, subtending several sessile blue flowers. Naturalized near Saco, 

 Maine, Montreal, etc. (Eu., N. Asia.) 



5. COLLINS ONI A, L. HORSE-BALM. 



Calyx ovate, enlarged and declined in fruit, 2-lipped ; upper lip truncate and 

 flattened, 3-toothed, the lower 2-cleft. Corolla elongated, expanded at the throat, 

 somewhat 2-lipped, the tube with a bearded ring within ; the 4 upper lobes 

 nearly equal, but the lower much larger and longer, pendent, toothed or lacer- 

 ate-fringed. Stamens 2 (sometimes 4, the upper pair shorter), much exserted, 

 diverging; anther-cells divergent. Strong-scented perennials, with large 

 ovate leaves, and yellowish flowers on slender pedicels, in loose and panicled 

 terminal racemes. (Named in honor of Peter Col/inson, a well-known patron 

 of science and correspondent of Linnaeus, who introduced it into England.) 



