376 LAIUAT.K. (mint FAMILY.) 



hciieath; calvx tcc-th suliulato, and, liko tlic hrofts, conimouly bearded. — 

 W.Mxl.s and fcjicerows. August- Mi-pt. — Sti'iii :i°-4'' liigli. Leaves 2'-3' 

 long. I"li)wer.>* wliilo. 



2. P. albescens, Gray. Smoother ; leaves smaller ; calyx teeth shorter 

 and hroader, olituse, beardless ; otiierwiso like the preceding. — With the 

 last. August -Sept. 



.1. P. Tullia, Renth. Villous-iiubescont ; leaves ovate or olilong, acute or 

 acuiniiiaic, the upper cauescent ; whorls large, loo.se, axillary and terminal ; 

 caly.x teeth subulate, long-beanled like tlie liracts; the 2 lower as long as the 

 tube. — Mountains, Alabama to Nortli Carolina. August- Sej)t. — Stem 2° -3° 

 high. Leaves 2' - 4' long. 



Var. dubium, Gray. Green thnnigiiout ; calyx teeth shorter. — Ashe 

 County, North Carolina (Gray Sf Casei/). 



* * Calyx teeth nearly equal. 



■*- Calyx as long as the corolla ; the teeth subulate and awn-pointed , like the rigid 

 bracts: cymes dense-flowered. 



4. P. aristatum, iNIichx. Tomentose and hoary, or sometimes hairy ; 

 stem l)r:uR-hod ; leaves ovate or oI)liing, acute, sparingly serrate, rounded at 

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

 terminal; ovary bearded. — Var. hyssopifolicm. Gray. Stem simple or 

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

 August - Sept. — Stem 1^° - 3° high. Leaves 1' - 2' long. 



■*- 4- Calyx teeth beardless and awnless : cymes capitate, mostly terminal: bracts 

 shorter than the flowers : leaves subsessile. 



5. P. pilosum, Nutt. Softly pubescent or villous ; branches short, erect ; 

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

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

 bracts, hoary-tomentose. — Upper di.stricts of Georgia, and northward. Au- 

 gust - Sept. — Stem 2° high. Leaves 1' - 2' long. 



6. P. muticum, Pers. Smooth or tomento.9e ; stem corymbosely 

 branclied ; leaves ovate or ovate-lanceolate, acute, serrate, rounded or slightlv 

 cordate at the base, sessile or short-petioled, the uppermost whitened ; cymes 

 small, compact, corymbose, minutely hoary-tomentose; calyx teeth short, 

 triangular-ovate, obtuse. — Dry soil. August -Sept. — Stem I°-2° high. 

 Leaves l'-2' long. 



7. P. leptodon, Benth. Stem 2° -.3° high, slightly pubescent ; leaves 

 oblong-lanceolato, serrate, smooth and green on both sides, the floral ones 

 faintly Whitened ; cymes compact ; calyx teeth subulate, shorter than the tube, 

 hirsute, like the slender-pointed bracts. — Mountains of North Carolina. 

 August. 



8. P. Torreyi, Benth. Stem more or less pubescent, nearly simple; 

 leaves (not whitened) linear-lanceolate, acute at both ends, nearly sessile and 

 entire ; calyx teeth subulate. — Tennessee {Dr. Gattinger), and northward.— 

 Stem 2' - 3° high. Leaves 2' long. 



