406 LABIATE. (MINT FAMILY.) 



2. ISANTHUS, Michx. FALSE PENNYROYAL. 



Calyx bell-shaped, 5-lobed, equal, enlarged in fruit. Corolla little longei 

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

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

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

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

 axillary 1 - 3-flowered peduncles. (Name from foos, equal, and &v6os, jiower l 

 referring to the almost regular corolla.) 



1. I. CSertlleus, 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, king of Troy.) 



1. T. Canadense, 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. Loosely pubescent; calyx villous 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 (Ont., and near Philadelphia). 



4. AJUGA, 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 a- privative, and 

 (vyov (Latin jugum], 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. COLLINSONIA, L. HORSE-BALM. 



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

 fattened, 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 

 ]i early 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 Collinson, a well-known patron 

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



