1 64 LABIATAE 



2. M. citriodora Cerv. Lemon Mint. Annual, l°-3° high, pnbern- 

 lent : leaves lanceolate, nearly sessile, sharply serrate : calyx teeth 

 bristle-pointed: corolla pinkish or whitish, 1' long. — Sparingly adventized 

 near Sheffield. July-August. 



14. BLEFHILIA Baf. 



Calyx 13-nerved, not villous in the throat, the three upper teeth awned, 

 the two lower shorter. Corolla, etc. , as in ilfonardo. Flowers in glomer- 

 ules, forming terminal spikes. 



1. B. hirsuta (Pursh) Torr. Wood Mint. Perennial, l°-3° high, 

 pubescent : leaves ovate, sharply serrate, slender-petioled : outer bracts 

 linear-lanceolate, acuminate- pointed. — Common throughout in rich 

 woods. June-August. 



15. HEDEOMA Pers. 



Ours are annuals with blue, axillary clustered flowers. Calyx 13-nerved. 

 Upper lip of corolla erect, emarginate, the lower 3-lobed, spreading. 

 Anther sacs divergent. 



Leaves ovate-oblong, serrate, petioled. 1. H. puUgioides. 



Leaves linear, entire, sessile. 2. B. hispida. 



1. H. pulegioides (L. ) Pers. Pennyroyal. e'-lS' high, hairy: 

 corolla 3" long : sterile filaments manifest.— Abundant in dry woods. 

 August-October. 



2. H. hispida Pursh. SPEING Pennyroyal. 3'-12' high, pubes- 

 cent: corolla 3" long : sterile filaments none. — Common in barrens 

 throughout. April-June. 



16. MELISSA L. 



Calyx 13-nerved, its upper lip three-toothed, the lower 2-parted. 

 Upper lip of corolla notched, the lower 3-parted. Anther sacs divaricate. 



1. M. officinalis L. Gaeden Balm. Perennial, pubescent, l°-3° 

 high : leaves ovate, petioled, orenate : corolla 6" long, whitish. — Along 

 roadsides near Independence. Bare. July-September. 



17. KOELLIA Moench. Mountain Mint. 

 Tufted perennials, l°-3° high, with white, purplish-dotted flowers. 

 Calyx about 13-nerved, equally 5-toothed in ours. Upper lip of corolla 

 nearly entire, a little arched, the lower 3-lobed, spreading. Anther 

 cells parallel. 



Stems smooth. 1, K. flexmaa. 

 Stems pubescent to downy. 

 Leaves entire. 



Plant minutely pubescent. 2. K. Virginiana. 



Plant hoary-pubescent. 3. K. pilosa. 



Leaves serrulate. 4, K. vertidllata. 



1. K. flexuosa (Walt. ) MacM. Nearly glabrous throughout : leaves 

 narrowly linear, entire : heads %"-\" broad : calyx teeth pungently 



