314 LAiUAT.'t:. Cmixt family) 



6. PYCNANTHEMUM, -Mi.hx. IIousk-mint. 



Calyx tiibiiliir, 13 iicrvi'il, naked in llie tliront, efjiialiy S-tootlicd, or sli^^litly 

 2-li]i]H'(l. Corolla 2-lipped ; the upper lip notched or entire, tlic lower 3-(left. 

 Stamens 4, nearly e(pial, strai;;ht, spreading, connnonly exserted : anther-cells 

 parallel. Style 2-clef't at the apex. Nutlets 8nu)otli. — IVrennial mostly J)U- 

 bescent or hoary herbs, with erect branchin;; stems. Floral leaves often whitc- 

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

 — Plants aromatic and pungent. 



* CdJyx more or less 2-llpped, the siihu/ute teeth often bearded with u-eak jointed hairs : 

 cymes most/y terminal, widely spreudin<j in fruit : bracts longer than the flowers: 

 leaves pubescent, the upjyermost whitened. 



1. P. inCEUUm, Miehx. Stem densch' 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, Xutt.) — Var. Tullia. (P. TuUia, Benlh.) Leaves smaller and 

 smoother; cymes 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 l'-2' long. Flowers white. 



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

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

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

 hairs ; the 2 lower ones shorter. — Mountains of Noi'th Carolina. Aug and 

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



* * Calyx-teeth nearly eipial. 



1- Calyx as long as the corolla ; the teeth snbidate and awn-pointed, like the rigid 



bracts : cymes denseflowend 



3. P. ai'istatum, Michx. Tomcntose and hoary, or sometimes hairy ; 

 stem 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 li°-3° high. Leaves 

 l'-2' long. 



■1- -t- Calyx-teeth beardless and aimless : cymes capitate, mostly terminal .• bracts 

 shorter than the flowers: leaves subsessile. 



4. P. pilosum, 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, acute, and, like the 

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

 Upper districts of Georgia, and northward. Aug. and Sept. — Stem 2° high. 

 Leaves l'-2' long. 



