LABIATiE. 275 



into a petiole ; cymose heads contracted, depressed-hemispheric ; calyx with 

 nearly equal lanceolate acuminate teeth. P. Virginicum Nutt. 



Dry rocky hills. Near Kingsbridge, N. Y. and Princeton, N. J. Torr. Aug., 

 Sept. '2J.. — Stem 2 feet high, sparingly branched. Leaves pale green. Heads 

 of flowers more than an inch in diameter, formed of densely agg*gated cymules. 

 Intermediate between P. dinopodioides and P. lanceolatum, but distinct. {Torr. 

 N.Y. FL) Torrey's Pycnanthemum. 



5. P. linifolium Pursh : stem much branched, smooth ; leaves linear, ses- 

 sile, rigid, entire ; bracts linear, acute, rigid ; teeth of the calyx lanceolate- 

 subulate. Brachystemum linifolium Wllld. 



Moist woods. N. Y. to Car. W. to Miss. July, Aug. %.—Stem 12—18 

 inches high, fastigiately branched. Florvers white with purple spots, in nume- 

 rous crowded hemispheric heads which are about 4 lines in diameter. 



Narrow-leaved Virginian Thyme. 



6. P. lanceolatum Pursh : stem paniculately branched above, pubescent 

 on the angles ; leaves lanceolate and lance-linear, entire, rigid, smoothish ; 

 bracts ovate-lanceolate ; teeth of the calyx obtuse. P. Virginicum Pers. 

 Brachystemum Virginicuvi Mich. 



Borders of wyods. N. Y. to Car. July, Aug. %.~Stem about 2 feet high, 

 obtusely 4-angled. Heads numerous, dense, fastigiate, about 4 hues in diam- 

 eter. Flowers small, reddish-white with purple dots. According to Bentham, 

 P. verticillatum of Persoon is a broad-leaved variety of this species. 



Broad-leaved Virginian Thyme. 



7. P.muticum Pers. : stem pubescent, paniculate at the summit; leaves 

 subsessile, ovate-lanceolate, acute, subserrate, veined, obtuse or rounded at 

 the base, smoothish, the upper ones canescent ; whorls dense, mostly in 

 terminal heads ; outer bracts ovate-lanceolate, acuminate. Brachystemum 

 muticum Mich. 



Dry hills. N. Y. to Geor. July, Aug. %.~Stem 2 feet high, with widely 

 spreading branches. Flowers reddish-white with purple spots, in dense terminal 

 heads which are about half an inch in diameter. 



Veiny-leaved Mountain Mint 



8. THYMUS. Linn.— Thyme. 

 (From the Greek dvjxo?, strength ; in allusion to its cordial qualities.) 

 Flowers whorled or capitate. Calyx ovoid, 13-jierved, bi- 

 labiate ; upper lip S-toothed ; lower bifid, the throat hairy. 

 Corolla with the upper lip erect, nearly flat, emarginate ; the 

 lower longer, spreading and 3-cleft. 



T. Serpyllum Linn.: stem branched, decumbent; leaves flat, ovate, 

 obtuse, entire, petioled, more or less ciUate at base ; flowers capitate. 



Fields. Perm. ; naturalized. Nutt. ^ Darlingt. July, Aug. %. — Stem 

 spreading, decumbent, branched. Leaves more or less hairy. Florvers purple, 

 in terminal heads. Wild Thyme. 



9. ORIGANUM. I/W%.— Marjoram. 



(From the Greek opo? , a hill, and yavo?, joy ; in allusion to its fragrance and 

 beauty in its native habitat.) 



Flowers collected into 4-sided dense spikes or heads. Calyx 



ovoid-tubular, 5-toothed. Corolla somewhat 2-lip|ted; uppei 



