642 Obdbb 89.— labiate 



T. CanadSnse 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 tlbwers ; upper teeth of calyx broader. — 1| Can. and 

 U. S., fields and road-3ides. St. about 2f high, usually simple, square, with eon- 

 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. ViRGiNioiTM. Lvs. ovate-oblong, crowded, large, subsessilo. (T. Virgini- 

 cum L.) — A well marked variety. 



5. TRICHOSTEM'MA, L. Blue Curls, (Gr. 0pi^, hair, OTrjfia, 

 itamen ; for its long, liair-like filaments.) Calyx very oblique, veiny, 

 unequally 5-tootlied, lower lip of 2 short teeth, upper twice as long, of 

 3 teeth, all acute; corolla tube slender, short, limb obliquely 6-lobed; 

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

 cate. — (D 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. oUong-lanceolate, attenuate at base, obtuse, entire pu- 

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

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

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

 1" wide. Ms. axillary and terminal, becoming inverted by the bending of the 

 pedicel. Cor. purple. Stam. 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. line^re Nutt. Lus. linear, nearly smooth ; st and branches pnberulent. — 

 Dry Boils, Jf. 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. OaL 

 very veiny, the short triangular teeth Setaceously acuminate. Pis. as in the other, 

 about 4" long. Jl., Aug. 



6. ISAN'THUS, Mx. False Pennyroyal. (Gr. laog, equal, dvdoc, 

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

 Calyx subcampanulate, equally 5-toothed, throat naked ; corolla 6-parted, 

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

 mens subequal, incurved, ascending, longer than the corolla.— M Herb 

 viscid pubescent, with lance-elliptic, entire lvs. acute at each end. Fla. 

 axillary. 



1 coerilleus Mx. — Branching, leafy, in dry fields, JT. and W. States, with the as- 

 pect of Pennyroyal. St. rounded, slender, 12 — 18' high, with branches and Iva. 

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

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

 longer than the tabo. 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 cmarginate ; stamens 4, straight, distant ; anther cells par- 

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

 ticils. 



I Verticils jipproximfttino:, forming a terminal, leafless aplke Nos. 1, J 



§ Verticils remote, axillary. Calyx naked in the throat Nos. 8, 4 



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

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

 slender, interrupted, attenuate aimie. — il 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 — 2 f high. Spikes composed of 



