374 LAiuAT.i:. (mint jamilv.) 



2. H. spicata, I'liit. Annual, cliisoly puliesccMt; stem obtusely 4-auf!;led, 

 muriiato; It-aves ovate, acute, coarsely serrate, loiigiHjtioled ; whorls sliort- 

 peduucleii, 3 - 6-Ho\vere(l, iuterruptedly racemose; calyx teeth spine-like, 

 spreading; corolla small, purple. — Tami)a aud Jacksouville, Florida. lutro- 

 duced. —Stem 2^-5^ high. 



3. H. pectinata, I'oit. Annual' pulie.scent ; stem often muricate; 

 leaves ovate, acute, serrate, twice as long as the jietiole, tlie uppermost ones 

 bract-like: whorls ])ackeil in dense one-sided pectinate spikes; caly.x villous 

 at tlietiiroat; corolla minute, pale puri)!e. — South Florida. — JStems 2°-6° 

 high. 



3. MENTHA, L. Mint. 



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

 lobe notched or entire. Stamens 4, ecjual, distant, straight: antiier cells par- 

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

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

 * Whorls approximate, njncate. 



1. M. viridis, L. (Speau-mint.) Stem aud leaves smooth ; leaves ovate- 

 lauceolatc, unei|ual]y serrate, nearly sessile; bracts leafy, aud, like the calyx, 

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

 subulate. — Damp soils. Introduced, aud sparingly uaturalized. July - Sept. 

 — Stem I°-2^ Idgh. Flowers pale blue. 



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

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

 olate; fruiting calyx round i.sh, the teeth short and acute. — Waste ground. 

 Sparingly introduced. — Stem l°-2° high. Corolla white. 



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

 base, ascending, branched ; leaves ovate-oblong, acute, .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 arillnri/. 



4. M. Canadensis, L. Hirsute or glal)rons; stem 1° high, branching; 

 leaves oblong or lanceolate, serrate, acnte ; 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 oldong or ovate; whorls dense, globose; calyx teeth lanceolate. — 

 Georgia. Introduced. 



6. M. aquatica, L., var. glabrata, Benth. (Bergamot Mint.) Smooth ; 

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

 calyx teeth 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 stameus 2, exserted; the upper pair 



