362 LABIATE. Hedeoma.' 



§ 1. EuHEDEOMA, Gray, 1. c. Flowers pedicellate, cymulose or rarely sub- 

 solitary in the axils of the leaves, the uppermost of which are sometimes dimin- 

 ished and bract-like : corolla with an even open throat : throat of the calyx in 

 fruit closed with a ring of villous hairs (except in H. acinoides) : low and diffuse 

 or much branched herbs, of dry soil, pungently sweet-aromatic, with small and 

 whitish or purplish flowers : pubescence of the stem usually retrorse. 



* Filaments of the posterior stamens manifest, bearing a capitate rudiment or sometimes a polli- 

 niferous anther: calyx rather short, conspicuously bilabiate; its upper and lower lips very 

 dissimilar. 



H. pulegioides, Pers. (American Pennyroyal.) Annual, erect, minutely pubes- 

 cent: leaves ovate or oblong, somewhat serrate, narrowed at base into a slender petiole; 

 floral similar or the upper merely smaller: calyx in fruit ovate-campanulate or oblong, 

 strongly gibbous ; upper lip broad and spreading, with 3 triangular teeth, about equalling 

 the two setaceous-subulate and hispid-ciliate teeth : corolla hardly exserted, 2 or 3 lines 

 long. — Syn. ii. 131 ; Bart. Med. t. 41. Melissa & Cunila pulegioides, L. Canada to Iowa 

 and southward ; common. 



# * Filaments of the posterior stamens minute subulate rudiments, or sometimes obsolete : teeth 



of both lips of the calyx subulate, 

 -(— About equal in length, all erect or in fruit curved upward : bracts linear or acerose-subulate, 



spreading or at length reflexed : erect annuals, with the upper flowers somewhat capitately or 



spicately crowded. 



H. acinoides, Scheele. Minutely pubescent, slender: leaves nearly glabrous, thinnish, 

 slenderpetioled, obscurely denticulate ; the lower ovate, upper oblong, or the upper floral 

 oblong-linear : bracts equalling the slender pedicels : calyx tubular, gibbous at base (3 lines 

 long), barely hairy in the throat; limb slightly bilabiate; the teeth setaceous-subulate, 

 minutely ciliate, barely one-third the length of the tube : tube of the purple corolla 

 exserted, slender (4 lines long) ; its lower lip much larger than the upper, and middle lobe 

 deeply emarginate. — Linn. xxii. 592 ; Gray, Proc. Am. Acad. viii. 366. — Arkansas, Leaven- 

 worth. Texas, Wright, Lindheimer, &c. 

 H. hispida, Pursh. Mostly low: leaves all similar, linear, entire, thickish, somewhat 

 nervose-veined, nearly sessile, crowded, almost glabrous, but their margins at least towards 

 the base hispid-ciliate : bracts mostly equalling the calyx, rigid : limb of the calyx bilabi- 

 ate ; the lips about half the length of the oblong gibbous hispid tube ; the teeth of the 

 upper subulate, of the lower more aristiform and hispid, equalling the (3 lines long) bluish 

 corolla. —Fl. ii. 414. H. hirta, Nutt. Gen. i. 16. Cunila hispida, Spreng. Syst. i. 54.— 

 Plains west of the Mississippi, from Dakota to Louisiana and Arkansas; also Ilbnois, 

 there apparently lately introduced. 

 •H- -K Two lower calyx-teeth decidedly longer than the three upper: bracts mostly erect and 



subulate. 

 ++ Leaves entire, or in the first species with rare and obscure denticulations or crenulations, into 



which the few and inconspicuous veins do not run: root either indurated and perduring-annual or 



perennial 

 H. thymoides. Cinereous-pubescent or puberulent, about a span high, at length diffusely 

 branched from the base : leaves ovate, obtuse (3 to 5 lines long), petioled ; the lower little 

 exceeding and the upper shorter than the flowers : bracts mostly subulate and shorter than 

 the pedicels : calyx oblong-tubular and at length rather strongly gibbous (the tube 1^ or 2 

 lines and the setaceous lower teeth a line or sometimes more in length); teeth of the upper 

 lip recurved away from the straightish and moderately longer lower ones : corolla little ex- 

 serted, only 3 lines long. — H. de.ntala, var. nana, Torr. Bot. Mex. Bound. 130. H. piperita ? 

 Gray, Proc. Am. Acad. viii. 366, not Benth., which must have much larger calyx, flat pedicels, 

 and more crenate leaves. — E. New Mexico to Arizona, Wright, Bigelow, Palmer, &c. 



Var. oblongif olia. Stems ereqt, even strict, sometimes a foot high : leaves oblong, 

 or the lower ovate, shorter-petioled ; the reduced floral ones subsessile and acute. — H. 

 piperita, var. ohlongifolia. Gray, 1. c. — New Mexico and Arizona ; same collectors. 

 H. Drummondi, Benth. Cinereous-pubescent or puberulent, a span or two high, 

 copiously branched : leaves from oblong (or the lowest oval) to linear, obtuse, subsessile, 

 or narrowed at base into a very short petiole, thickish ; the upper mostly rather shorter 

 than the few flowers in their axils : small subulate bracts not longer than the pedicels : 



