ORDER 91. LABIATE. 241 



C mariana L. Lvs. ovate, serrate, subsessile, 1' ; cymes pedunculate, corymbous, 

 axillary and terminal, u Kocky woods, N. Y. to Ga. and Ark. 1 2f. July, Aug. 



13. HEDEOMA, Pers, AMERICAN PENNYROYAL. Calyx 13-striate. 

 gibbous at base, bilabiate, throat hairy, upper lip 3-toothed, lower 2-clefk 

 Cor. bilabiate, upper lip erect, flat, emarginate, lower spreading, 3-lobed. 

 Stam. 2, fertile, ascending. Low, fragrant herbs. 



1 H, pulegioid.es Pers. Lvs. oblong, few-toothed, petiolate, narrowed to each end ; 



verticils axillary, 6-flowered ; corolla equalling the calyx. Dry pastures. 612'. 

 June Aug. A small herb of pungent fragrance and taste, common and much used. 



2 H. hispida Ph. Hairy, branching, with sessile, linear, obtuse leaves and verticils 



6-flowered ; corolla scarcely exceeding the calyx. (?) Banks, W. 25'. July. 



14. COLLINSONIA, L. HORSE BALM. Cal. ovoid, 10-striate, upper 

 lip truncate, 3-toothed, lower 2-cleft. Cor. exserted, bell-ringent, upper lip 

 in 4 subequal lobes, lower longer, declined, fringed. Stam. 2 or 4, much 

 exserted, divergent, it Coarse, strong scented, with large, ovate, serrate, 

 petiolate Ivs. and yellowish fls., in a terminal, leafless panicle or raceme. 



* Stamens 4, perfect, long exserted. Leaves very large. South Nos. 1, ? 



* Stamens 2, perfect, a the upper pair of filaments mere points Nos. 3, 4 



a the upper pair of filaments capitate. South No. 5 



1 C. vertlcillata Baldw. Viscid-downy above ; Ivs. broad-oval, 6 8', acnte, peti- 



oles 1 2' ; racemes long, naked ; flowers in whorls, 9" ; lower lip strongly fringed. 

 Lookout Mt, Tenn., and Middle Ga. 1 2f. Raceme If. May, June. 



2 C. anisata Ph. Viscid-downy ; Ivs. cordate, acuminate, crenate. 57', petiole 1' ; 



panicle 3 6', bracts ovate, flowers 50". Ga., Fla., Ala. 1 2f. July Sept. 



3 C. Canadensis L. Sparsely downy ; leaves mucronate-serrate, acuminate, abrupt 



at base, 47' ; lower petioles slender ; panicle 58', loose, bracts ovate ; flowers 

 56". Damp shades, Can. to La. (Hale). 3 4f. Summer. 



4 C. scabriuscula Ait. Leaves scabrous above, small (1J- 2'), acuminate, acute at 



base, petioles slender, 1' ; panicle leafy, fls. 4 5", calyx 1". Woods, S. 2f. Sept. 



5 C. pimctata Ell. Pubescent ; Ivs. 47', lance-ovate, pointed, acute at base, resin- 



ous-punctate beneath ; panicle leafy below, flowers 5". Woods, S. 2 6f. Sept.+ 



15. HYSSOPUS, L. HYSSOP. Calyx tubular, 15-striate, equally 5- 

 toothed. Upper lip of the corolla erect, flat, emarginate, lower 3-parted, 

 the middle segment largest, tube about as long as the calyx. Stamens 4. 

 If. officiiialls L. Native of Europe and Asia, occasionally cultivated for its medici- 

 nal properties. A bushy herb, 2f, with oblong-lanceolate leaves, and bright blue 

 fls. in 1-sided verticils approximate in a terminal spike. St. exserted, diverging. 



16. PYCNANTHEMUM, MX. BASIL. Calyx tubular, 10-13-striate, 

 5-toothed, teeth equal or subbilabiate, throat naked within. Upper lip of 

 corolla nearly entire, lower trificl, middle lobe longest, all ovate, obtuse, 

 stam. 4, distant, subequal, anth. with parallel cells. U Erect, rigid branch- 

 ing herbs, all N. American. Verticils dense, many-flowered. Aug., Sept 



Calyx 2-lipped, in flat or loose cymes. Leaves petiolate, subserrate. ..(a) 

 1 Calyx subregular, in roundish dense heads.. . (i) 



a Teeth of the calyx ovate, acute, awnless No. 1 



a Teeth of the calyx tipped with bearded awns ." Nos. 24 



b Calyx teeth and bracts with naked awns as long as the corolla Nos 5, 6 



b Calyx teeth awnless. shorter than the corolla, .(c) 



