362 LABIATE. Hedeoma. 



1. EUHEDEO.AIA, 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 ovatc-campanulatc 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 puleyioidcs, 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, 



t 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 capitatelv or 

 spicately crowded. 



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

 slender petioled, 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. 306. Arkansas, Leaven- 

 wortli. Texas, Wright, Lindhcimer, &c. 



H. hispida, Pursll. Mostly low : leaves all similar, linear, entire, thickisli, 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. //. lu'rta, Nutt. Gen. i. 10. Cuulla lilspida, Spreng. Syst. i. 54. 

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

 there apparently lately introduced. 



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

 subulate. 



H- 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 lj 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. //. dentala, var. nawi, Torr. Bot. Mex. Bound. 130. II. ]>ijwn'tu ? 

 Gray, Proc. Am. Acad. viii. 306, not Benth., which must have much larger calyx, flat pedicels, 

 and more crenate leaves. E. New Mexico to Arizona, Wr'ujht, Bi</<-low, Palmer, &c. 



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

 or the lower ovate, shorter-petiolcd ; the reduced floral ones subsessile and acute. //. 

 pipcrita, var. oblongifdia, Gray, 1. c. New Mexico and Arizona ; same collectors. 



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

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

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

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



