31 t LABIAT.fi. (MINT FAMILY) 



6. PYCNANTHEMUM, Michx. Horsk-mint. 



Calyx tubular, 13-nervcd, naked in the throat, equally 5-toothed, or slightly 

 2-lipped. Corolla 2-lippcd ; the upper lip notched or entire, the lower 8-cleft. 

 Stamens 4, nearly equal, straight, Bpreading, commonly exserted : anther-cells 

 parallel. Style 2-cleft at the apex. Nutlets smooth. — Perennial mostly pu- 

 bescent or hoary herbs, with erect branching stems. Floral leaves often white- 

 tonientosc. Cymes mostly terminal, bracted. Corolla small, white or purplish. 

 — Plants aromatic and pungent. 



* Calyx more or less ^.-lipped, the subulate teeth often bearded with weak jointed hairs : 

 cymes mostly terminal, icidely spreading in fruit : bracts longer than the flowers: 

 leaves pubescent, the uppermost ichitened. 



1. P. incanum, Michx. Stem densely pubescent and hoary ; leaves ovate 

 or oblong-ovate, acute, sharply serrate, short-petioled, hoary-tomentose beneath ; 

 calyx-teeth subulate, and, like the bracts, commonly bearded with weak hairs. 

 (P Loomisii, Nutt.) — Var. Tullia. (P. Tullia, Denth.) Leaves smaller and 

 smoother; cynics larger and more expanded; calyx-teeth longer. — Var. al- 

 bescens. (P. albescens, Gray.) Leaves ovate-lanceolate, obtuse, smooth above, 

 hoary beneath ; calyx-teeth triangular lanceolate, obtuse, not bearded. — Dry 

 woods and fence-rows, Florida to Mississippi, and northward. Aug. and Sept. — 

 Stem 2° -4° high. Leaves 1' - 2' long. Flowers white. 



2. P. dubium, Gray. Stem villous-pubeseent ; leaves lanceolate, acute 

 at each end, smooth or nearly so, entire; cymes hoary, dense-flowered, short- 

 peduncled ; calyx-teeth subulate, tipped, like the bracts, with a tuft of weak 

 hairs; the 2 lower ones shorter. — Mountains of North Carolina. Aug. and 

 Sept. — Stem 2° - 3° high. Leaves 2' - 3' long. 



* * Calyx-teeth nearly etptal. 



•4- Calyx as long as the corolla ; the teeth subulate and awn-jmnted, like the rigid 

 bracts : cymes dense-flowered. 



3. P. aristatum, Michx. Tomentose and hoary, or sometimes hairy ; 

 -ti in branched; leaves ovate or oblong, acute, sparingly serrate, rounded at the 

 base, short-petioled, the uppermost somewhat whitened ; cymes mostly terminal ; 

 ovary bearded. — Var. hyssopifolium, Gray. Stem simple or corymbose 

 above; leaves rigid, linear-oblong, obtuse, entire. — Low ground, Florida to 

 Mississippi, and northward. Aug. and Sept. — Stem l£°-3° high. Leaves 

 l'-2' long. 



*_ *_ Calyx-teeth beardless and aimless: cymes capitate, mostly terminal: bracts 

 shorter than the flowers: leaves subsessile. 



4. P. pilOSlim, Nutt. Softly pubescent or villous ; branches short, erect , 



leaves lanceolate, entire, acute at each end, none of them whitened ; cymes 

 small, compact, corymbose; calyx-teeth ovate-lanceolate, acme, and, like the 

 bracts, hoary tomentose, or, in var. lbptodon, Gray, subulate and villous. — 

 Upper <I i - 1 1 i< t ^ of Georgia, ami northward. Aug. aud Sept. — Stem 2° high. 

 Leaves 1'- 2' long. 



