40G LABiAT.i:. (mint family.) 



2. ISaNTHUS, .Michx. False Pennyroyal. 



Calyx 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-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 X<ros, equal, and 6.v0os, flower, 

 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, Augr..st. 



3. TEtrCRIUM, 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 Teticer, king of Troy.) 



1. T. Canadense, L. (American Germander. Wood Sage.) Per- 

 ennial, doicnij, 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 ; cali/x 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 ivith viscid 

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

 wise like the lasj. — AAvestern 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 Avith the middle lobe emarginate or 2-cleft. Sta- 

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

 ^vyov (Latin jugnm), yoke, from the seeming absence of a yoke-fello\v to the 

 lower lip of the corolla.) 



A. REPTANS, L. Perennial, ahout 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 Avithin ; 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 CoUinson, a well-known patron 

 of science and correspondent of Linnaus^ who introduced it into England.) 



