542 ORDER 89. LABIATJE. 



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T. Canad6nse L. Plant erect, hoary-pubescent; Ivs. lanceolate, acute, serrate, 

 petiolate ; bracts linear-lanceolate, about as long as the calyx ; spike long, of 

 many crowded verticils of flowers ; upper teeth of calyx broader. If Can. and 

 U. S., fields and road-sides. St. about 2f high, usually simple, square, with con- 

 cave sides. Lvs. 3 times as long as wide, somewhat rounded at base, green 

 above, more or less hoary beneath. Fls. disposed in a terminal spike. Cor. pur- 

 plish, apparently without the upper lip, instead of which is a fissure through 

 which the stamens are exserted. Jl. 



P. VIRGINICUJI. Lvs. ovate-oblong,, crowded, large, subsessile. (T. Virgini- 

 cum L.) A well marked variety. 



5. TRICHOSTEM'MA, L. BLUE CURLS. (Gr. Opi hair, orffia, 

 Btainen ; for its long, hair-like filaments.) Calyx very oblique, veiny, 

 unequally 5-toothed, lower lip of 2 short teeth, upper twice as longj of 

 3 teeth, all acute; corolla tube slender, short, limb obliquely 5-lobed; 

 stamens 4, filaments very long, exserted and curved ; anther cells divari- 

 cate. Cymes loose, the central, that is, terminal fls. incurved, or re- 

 supinate by the continued growth of the stem. Cor. blue. 



1 T. dichotoma L. Lvs. oblong-lanceolate, attenuate at base, obtuse, entire pu- 

 bescent, as well as the stem and branches. Dry or rocky soils, Mass, to Ga., La., 

 111. An interesting plant a foot high. St. obtusely 4-angled, hairy, bushy. 

 Branches opposite and dichotomous. Lvs. slightly petiolate, 1' to 18" long, 4 to 

 7" wide. Fls. axillary and terminal, becoming inverted by the bending of the 

 pedicel. Cor. purple. Stara. slender, of a delicate, purplish hue. gracefully bend- 

 ing from the lower lip of the corolla to the upper, forming an arch. Aug. 



2 T. lineare Nutt. Lvs. linear, nearly smooth ; st and branches puberulent 

 Dry soils, N. Y. (at Salem) to Ga. and La. Very slender, a foot high, branched 

 above, or often its whole length. Lvs. 1' to 18" long, 2" rarely 3" wide. Cal. 

 very veiny, the short triangular teeth setaceously acuminate. Fls. as in the other, 

 about 4" long. Jl., Aug. 



6. ISAN'THUS, MX. FALSE PENNYROYAL. (Gr. 100$, equal, tivOoc, 

 the flowers being regular ; a character very rare among the Labiatae.) 

 Calyx subcampanulate, equally 5-toothed, throat naked ; corolla 5-parted, 

 tube straight and narrow, segments of the- border ovate and equal ; sta- 

 mens subequal, incurved, ascending, longer than the corolla. If. Herb 

 viscid pubescent, with lance-elliptic, entire Ivs. acute at each end. Fls. 

 axillary. 



I. cceruleus MX. Branching, leafy, in dry fields, N. and ~W. States, with the as- 

 pect of Pennyroyal. St. rounded, slender, 12^18' high, with branches and ivs. 

 opposite. Lvs. an inch or less in length, and a fourth as wide, distinctly tripli- 

 veined. Fls. numerous, 1 or 2 in each axil, blue. Calyx leaves lanceolate, 

 longer than the tube. Jl. 



7. MENTHA, L. MINT. (Mintha, the daughter of Cocytus, is fabled 

 to have been changed into one of these plants.) Calyx equally 5-toothed ; 

 corolla nearly regular, tube scarcely exserted, border 4-cleft, the broad- 

 est segment emarginate ; stamens 4, straight, distant ; anther cells par- 

 allel ; filaments naked. 2 Strong scented herbs. Fls. in dense ver- 

 ticils. 



Verticils approximating, forming a terminal, leafless spike Xos. 1, 2 



Verticils remote, axillary. Calyx naked in the throat Nos. 3, 4 



1 M. viridis L. SPEARMINT. Lvs. subsessile, oblong-lanceolate, acute, incisely 

 serrate; bracts setaceous, and, with the teeth of the calyx, somewhat hairy; spikes 

 slender, interrupted, attenuate above. 11 Can. and U. S. Plant highly esteemed 

 for its agreeable, aromatic properties. In wet soils, rapidly spreading by its creep- 

 ing roots, with erect, branching, 4-angled stalks, 1 2f high. Spikes composed of 



