] 64 LABI AT AE 



2. M. citiiodora Cerv. Lemon Mint. Annual, 1°-3° high, puberu- 

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

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

 near Sheffield. July-August. 



14. BLEPHILIA Raf. 



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

 the two lower shorter. Corolla, etc., as in 3Ionarda. 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. \. H. puJegioides. 



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



1. H. pulegioldes (L. ) Pers. Pennyroyal. 6^-15^ high, hairy: 

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

 August-October. 



2. H. hispida Pursh. Spring 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. Garden Balm. Perennial, pubescent, l°-3° 

 high : leaves ovate, petioled, crenate : corolla (/' long, whitish.— Along 

 roadsides near Independence. Rare. 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.flexuosa. 

 Stems pubescent to downy. 

 Leaves entire. 



Plant minutely pubescent. 2. K. Virginiana. 



Plant hoary-pubescent. 3. K. pilom. 



Leaves serrulate. 4. K. verdcilhtla. 



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

 narrowly linear, entire : heads 2^^-V^ broad : calyx teetii pungently 



