DIDYNAMIA GYMNOSPERMIA. 389 



i9. PYCNANTHEMUM. Mountain-mint 



* Stamens exserted. 



P. incanum : leaves oblong-ovate, shortly petiolate, hoary tomentose ) 

 heads of flowers pedunculate, compound, lateral and terminal ; bracta 

 setaceous. 



HAB. Rocky hills. July Aug. 1{.; plant whitish, soft, 2 feet 

 high ; Jlower pale red. 



P. aristatum : leaves lanceolate-ovate, subserrate, on very short peti- 

 oles, whitish ; heads sessile ; bracts awned. 



HAB Dry woods. Aug. July, 7J.; stem I 2 feet high; upper 

 leaves hoary. 



P. linifolium: stem straight, much branched, somewhat scabrous; 

 leaves linear, 3-nerved, very entire, smooth ; heads terminal, in a fas- 

 ciculate corymb. 



HAB. Dry swamps. Aug. 7|.; stem 12 18 inches, fastig. branch. 

 -Jlower minute, white. 



* * Stamens included. 



P. lanceolatum : stem straight, branched, subpubescent ; leaves sub- 

 sessile, linear-lanceolate, entire ; heads sessile, fasciculate-corymbed. 



HAB. Dry hills. Aug. Tj.; stem 2 feet high ; leaves long, nerved ; 

 Jlower minute, white. 



P. muticum: leaves ovate-lanceolate, subdentate, smoothish; heads 

 terminal ; bracts lanceolate, rather acute. 



HAB. Rocky hills. July Aug. 7|. ; stem 2 feet high ; leaves large, 

 Jlower white. 



270. CLINOPODIUM. Wild-basil. 



C. vulgar e: leaves ovate, subserrate; whorls hairy; pedicels branch- 

 ed ; bracts setaceous. 



HAB. Rocky woods. July, TJ.; stem 2 feet high, hairy; leaves 

 petiolate ; Jlower purplish. 



271. ORIGANUM. Wild marjoram. 



O. vulgare : spikes roundish, panicled, fasciculate, smooth ; bracts 



ovate, longer than the calyx ; leaves ovate, entire. 

 HAB. Fields, &c. June Oct. Ij. ; stem num., 1 foot high ; Jlower 



rose-colored, crowded. 



272. PRUNELLA. Self-heal, 



P. vulgaris : leaves ovate-oblong, petiolate ; upper lip of the calyx 



truncate, 3-awned ; stem ascending. 

 HAB. Meadows. May Aug. 1].; a foot high, hairy; Jlowern in 



large ovate spikes, purple. 



