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. IStameus 4, slightly didynamous, iucurved-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 ia-os, erjiuil, and &i/6os, Jiower 

 referring to the almost regular corolla.) 



1. I. cseruleus, 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 Teiicer, king of Troy.) 



1. T. Canadense, L. (American Germander. AVood Sage.) I'er- 

 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. Loos.ely pubescent; calyx viUous icith viscid 

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

 wise like the last. — A western form, from Neb. southwestward, and extending 

 eastward (Out., 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. REi'TANS, L. Perennial, about 1° high, Avith 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 

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

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

 nearly equal, hut 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 yelloAvish flowers on slender pedicels, in loose and jjanicled 

 terminal racemes. (Named in honor of Peter CoUinson, a well-known patron 

 of science and correspondent of Linmeus. who introduced it into England.) 



