ORDER 91. LABIATE. 241 



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

 axillary and terminal. 11 Rocky 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-clefL 

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

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



1 II . ptilegloides Pers. Lvs. oblong, few-toothed, petiolate, narrowed to each end ; 



verticils axillary, 6-flowered ; corolla equalling the calyx. @ Dry pastures. 6 12'. 

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



2 H. li IK pi da Ph. Hairy, branching, with sessile, linear, obtuse leaves and verticils 



ti-flowcred ; corolla scarcely exceeding the calyx. (T) Banks, W. 2 5'. 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 H 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, 2 



* 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', acute, peti- 



oles 12' ; 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. aiilsata Ph. Viscid-downy ; Ivs. cordate, acuminate, crenate, 57', petiole V ; 



panicle 3 6', bracts ovate, flowers 5 b". Ga., Fla., Ala. 1 2f. July Sept. 



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



at base, 47' ; lower petioles slender ; panicle 5 8 / , loose, bracts ovate ; flowers 

 5 6". Damp shades, Can. to La. (Hale). 3 4f. Summer. 



4 C. scabrluscula Ait. Leaves scabrous above, small (lj 2'), acuminate, acute at 



base, petioles slender, 1' ; panicle leafy, fls. 45", calyx 1". Woods, S. 2f. Sept. 



5 C. pnnctata Ell. Pubescent; Ivs. 4 7', lance-ovate, pointed, acute at base, resin- 



ous-punctate beneath ; panicle leafy below, flowers 5". Woods, S. 2 (if. 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. 



H. offlclnalis L. Native of Europe and Asia, occasionally cultivated for its medici- 

 nal properties. A bushy herb, 2f, with oblong-lanceolftte 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 trifid, middle lobe longest, all ovate, obtuse, 

 stain. 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) 

 { Calyx subregular, in roundish dense heads.. .(&) 



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



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



b Calyx teeth aud bracte with naked awns as long as the corolla Nos 5, 1 



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



