Ajuga. LABIATE. 349 



3. ISANTHUS, Michx. (From i'aog, equal, and avdog, flower : calyx and 

 corolla nearly regular.) — Single species. 



I. caenileus, Michx. Low and erect annual, somewhat viscid-pubescent, pungently 

 aromatic, copiously branched: leaves oblong-lanceolate or broader, acute at both ends, 

 somewhat petioled : peduncles axillary, 1-3-flowered : corolla blue, 2 or 3 lines long, 

 little exceeding the calyx. — Fl. ii. 3, t. 30. Tridmstema braditatum,h. I.e. (Dill. Eltli. 

 t. 285.) — Dry or sterile ground, common from Canada to Georgia, Kentucky, and Texas : 

 fl. all summer. 



4. TEtTCRIUM, L. Germander. (Teucer, first king of Troy.)— Less 

 aromatic herbs or unde'rshrubs, mainly of the Old World: fl. summer. 



# Erect perennial herbs: leaves undivided: flowers in naked terminal spikes or racemes, short- 

 pedicelled, 1 to 3 to each bract: calyx campanulate, moderately 5-lobcd; two lower teetli tri- 

 angular-subulate; three upper ovate: "nutlets globular and with a roundish scar. 



T. Canadense, L. Soft-pubescent to canescent-tomentose, 1 to 3 feet high : leaves 

 oblong-ovate to oblong-lanceolate, sharply serrate, short-petioled : spike at length 6 to 12 

 inches long : flowers short-pedicelled : corolla purple, rose, or sometimes cream-color, half 

 inch long : calyx canescent, sometimes distinctly short-pubescent ; the 3 upper lobe's very 

 obtuse. — Spec. ii. 504. T. Virginicum, L. I.e. (pi. Gronov. Virg.) ; Schk. Handb. t. 155. — 

 Low grounds, Canada to Texas. (Mex.) 



Var. angustatum. Leaves lanceolate, very acutely serrate (2 inches long, 3 to 6 

 lines wide) : pubescence all minute. — Camp Grant, Arizona, Palmer. 



T. OCCidentale. Loosely pubescent, more branched, a foot or two high : leaves smaller 

 (1 or 2 inches long), ovate-oblong to broadly lanceolate : corolla 4 or 5 lines long : calyx 

 villous with viscid hairs ; upper lobes acute or the middle one acuminate. — Nebraska, 

 (Hayden, &c.) to New Mexico (Fendler, Wright), Arizona (Palmer), and on the Sacramento, 

 California (T. Canadense, Torr. in Bot. Wilkes), collected there only by the Wilkes Expe- 

 dition. (T. infiatum, Swartz, has a globular fructiferous calyx, with upper lobes obtuse, 

 nutlets angulate ventrally, &c.) 



# # Low and diffuse herbs: leaves multifid or incised, having solitary pedicellate flowers in their 

 axils; the uppermost more or less reduced or bract-like: calyx almost 5-parted into subulate- 

 lanceolate equal lobes. 



T. Cubense, L. Glabrous or nearly so, branched from the annual root, about a foot 

 high : leaves cuneate ; the lower obovate-cuneate or rhomboidal and short-petioled, cre- 

 nately incised, sometimes 3-5-cIeft to the middle ; upper sessile, palmately 3-cleft or 3-5- 

 toothed, exceeding the flowers : corolla (pale blue or white, 3 or 4 lines long) hardly 

 exceeding the calyx: nutlets suberous-thickened, obscurely few-ribbed lengthwise and 

 punctate-impressed between the ribs. — Mant. 80; Jacq. Stirp. t. 183, f. 74, & Obs. t. 30. 

 T. Ucviaatum, Vahl, Symb. i. 40. — Texas to S. E. California. (W. Ind., Mex. to Buenos- 

 Ay res.) 



T. laciniatum, Torr. Glabrous or hirsute-pubescent, much branched from a lignescent 

 perennial root, a span or so high : leaves pinnately 3-7-parted into narrow linear entire or 

 2-3-lobed or toothed divisions, rather rigid; the floral much crowded, 3-parted ; upper 

 equalling the flowers: corolla (pale blue or lilac, to 10 lines longl with spatulate lower 

 lobe much surpassing the calyx: nutlets not obviously costate. — Ann. Lye. N. Y. ii. 231 ; 

 Benth. in DC. Prodr. xii. 579. T. Cubense, in part, Torr. Bot. Mex. Bound. 135. — Plains 

 of Colorado to W. Texas and Arizona. (Adjacent Mex.) 



5. AJUG-A, L. (Formed of a privative, and tyyov, a yoke, from the seeming 

 absence of a yoke-fellow to the lower lip of the corolla.) — Low herbs of the Old 

 World (Europe to Japan and Australia), one scantily naturalized in a few stations : 

 fl. summer. 



A. keptans, L. Perennial, a span or so high, with copious creeping stolons : leaves obovate 

 or spatulate, sometimes repand-sinuate ; cauline sessile ; lowest and radical with long taper- 

 ing base ; floral approximate, subtending several sessile blue flowers. —Fields, Montreal, 

 Canada, Madarjan. Saco, Maine, Goodale. (Eu., N. Asia.) 



