LABIAT/E. 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. Tj.. Stem 2 feet high, sparingly branched, Leaves pale green. Heads 

 of flowers more than an inch in diameter, formed of densely aggregated cymules. 

 Intermediate between P- clinopodioides and P. lanceolatum, but distinct. (Torr. 

 N. Y. Fl.) Torrey's Pycnanlhemum. 



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

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

 subulate. Brack]) 'Sternum linifolium Wittd. 



Moist woods. N. Y. to Car. W. to Miss. July, Aug. %. Stem 1218 

 inches high, fastigiately branched. Flmvers 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 Virginicum Mich. 



Borders of woods. N. Y. to Car. July, Aug. Tj.. Stem about 2 feet high, 

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

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

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



Broad-leaved Virginian Thyme. 



7. P. muticum Pcrs. : 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. Drachystemum 

 muticum Mich. 



Dry hills. N. Y. to Geor. July, Aug. '2J-. Stem 2 feet high, with widely 

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

 heads which are about half an inch in diameter. 



Veiny-leaved Mountain Mint 



8. THYMUS. Linn. Thyme. 

 (From the Greek 0vpv, strength ; in allusion to its cordial qualities.) 



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

 labiate ; upper lip 3 -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 ciliate at base ; flowers capitate. 



Fields. Penn. ; naturalized. Nutt. fy Darlingt. July, Aug. Ij.. Stem 

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

 in terminal heads. Wild Thyme. 



9. ORIGANUM. Linn. Marjoram. 



(From the Greek PO?, a hill, and y.if05,^'oy ; in allusion to its fragrance and 

 beauty in its native habitat.) 



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

 ovoid-tubular, 5-toQthed. Corolla somewhat 2 -lipped ; uppei 



