374 LABIATE. (MINT FAMILY.) 



2. H. spicata, Poit. Annual, closely pubescent ; stem obtusely 4-augled, 

 mnricate ; leaves ovate, acute, coarsely serrate, long-petioled ; whorls short- 

 peduucled, 3 - 6-flowered, interruptedly racemose; calyx teeth spiae-like, 

 spreading; corolla small, purple. Tampa and Jacksonville, Florida. Intro- 

 duced. Stem 2 -5 high. 



3. H. pectiliata, Poit. Annual '{ pubescent ; stem often murioate ; 

 leaves ovate, acute, serrate, twice as long as the petiole, the uppermost ones 

 bract-like: whorls packed in dense one-sided pectinate spikes; calyx villous 

 at the throat; corolla minute, pale purple. South Florida. Stems 2 -6 

 high. 



3. MENTHA, L. MINT. 



Calyx tubular, nearly equally 5-toothed. Corolla equally 4-lobed, the upper 

 lobe notched or entire. Stamens 4, equal, distant, straight: anther cells par- 

 allel. Style 2-cleft at the apex. Nutlets smooth, obtuse. Aromatic herbs. 

 Whorls axillary, or forming a dense or interrupted terminal spike. 



* Whorls approximate, spicate. 



1. M. viridis, L. (SPEARMINT.) Stem and leaves smooth ; leaves ovate- 

 lanceolate, unequally serrate, nearly sessile ; bracts leafy, and, like the calyx, 

 smooth or hairy; spike cylindrical, interrupted below; calyx teeth linear- 

 subulate. Damp soils. Introduced, and sparingly naturalized. July -Sept. 

 Stem l-2 high. Flowers pale blue. 



2. M. rotundifolia, L. Soft-hairy; stem erect; leaves roundish, ru- 

 gose, crenate, sessile, hoary beneath ; spikes oblong, interrupted ; bracts lance- 

 olate ; fruiting calyx roundish, the teeth short and acute. Waste ground. 

 Sparingly introduced. Stem 1- 2 high. Corolla white. 



3. M. piperita, L. (PEPPERMINT.) Smooth ; stem creeping at the 

 base, ascending, branched ; leaves ovate-oblong, acnte, sharply serrate, rounded 

 at the base, short-petioled ; spikes slender, interrupted ; bracts mostly longer 

 than the whorls, the upper ones linear ; calyx teeth hairy. Low ground. 

 Introduced. July -Sept. Stems l-2 high. Flowers white or blue. 



* * Whorls axillary. 



4. M. Canadensis, L. Hirsute or glabrous ; stem 1 high, branching; 

 leaves oblong or lanceolate, serrate, acute ; whorls peduncled, densely many- 

 flowered ; calyx teeth short, acute ; corolla pale purple. Low ground, Ten- 

 nessee, and northward. 



5. M. arvensis, L. (CORN MINT.) Downy and somewhat canescent ; 

 leaves oblong or ovate ; whorls dense, globose ; calyx teeth lanceolate. 

 Georgia. Introduced. 



6. M. aquatica, L., vnr. glabrata, Benth. (BERGAMOT MINT.) Smooth ; 

 leaves ovate, sharply serrate ; whorls loose, peduncled, single or racemose ; 

 calyx teetli subulate. Manatee, South Florida ( Garber). Introduced. 



4. LYCOPUS, L. 



Calyx bell-shaped, equally 4 -5-toothed, naked at the throat. Corolla bell- 

 shaped, exserted, equally 4-cleft. Fertile stamens 2, exserted ; the upper pair 



