DIDYNAMIA.— GYMNOSPERMIA. 23;} 



HAB. Hedges, &c. April — June. U . Root creep. : 

 stem decumb. ; fl. axill., in threes, blue. §. 



379. MARRUBIUM. Horehound. Labialce. 



yi. vulgare: stem erect; leaves roundish-ovate, 

 dentate, rugose ; calyx with 10 setaceous, uncinate 

 teeth. 



HAB. Road-sides, &c. Stem 12 — 18 in. high, whi 

 tishpub. ; leav. woolly beneath. §. 



*. Stamens exserted. 



1. P. incanum: leaves oblong-ovate, shortly petiolate, 



hoary-tomentose ; heads of flowers pedunculate, 

 compound, lateral and terminal ; bracts setaceous. 

 HAB. Rocky hills. July— Aug. U. Plant whi- 

 tish, soft t 2 ft. high ; fl. pale red. 



2. P. aristatum: leaves lanceolate-ovate, subserrate. 



on very short petioles, whitish ; heads sessile : 

 bracts awned. 

 HAB. Dry woods. July— Aug. U . Stem 1—2 

 ft. high; tipper leav. hoary. 

 '., P. limfolium : stem straight, much branched, some- 

 what scabrous ; leaves linear 3-uerved, very en- 

 tire, smooth ; heads terminal, in a fasculate co- 

 rymb. 

 HAD. Dry swamps. Aug. i| . Stem 12 — 18 in, 

 fastt 'g. branch ; fl. minute* wh. 



**. Stamens included. 



A. P. lanceoiatnm : stem straight, branched, subpu 

 bescent ; leaves subsessile, linear-lanceolate! en- 

 tire ; heads sessile, fasciculate-corymbed. 

 HAB. Dry bilk. Atig. U. Stem 2 ft. high ; leav. 

 long, nerved; fl. minute, wh. 

 '. verticillatum : leaves ovate-lanceolate, very en 

 tire ; whorls sessile, compact ; bracts acuminate 

 HAB. Mountains. July — Aug. U. 

 (a i'. tnuticum: leaves ovate-lanceolate, subdentate, 

 -othish ; heads terminal ; bracts lanceolate, ra- 

 ther acute. 



