200 



GAMOrETALOUS EXOGENS 



ft Calyx nearly equally 5-toothed; leaves subsessile. 



2. P. Biikticum, Pers. Leaves ovate-lanceolate, the upper 

 ones hoary-pubescent; cymules rather dense; bracts lanceolate. 



MUTIC, OE AWNLESS PYCXANTHEMUM. 



Stem 2 to 3 feet high, paniculately branched at summit. Leaves 1 to 3 inches 

 long, denticulate, or sometimes entire. Flmvers in terminal heads, sometimes 

 with a compact verticil in the first axil below. Bracts ciliate. Calyx-teeth short. 

 Corolla reddish white, with purple dots. Stamens included. Nutlets smooth. 

 Hab. Hilly woodlands : frequent. Fl. July. Fr. Sept, 



3. P. laiiceolsituin, Pursh. Stem pubescent; leaves lanceo- 

 late, and lance-linear, penninerved; cymules compact, terminal 

 and sub terminal. 



LANCEOLATE PYCNANTHEMUM. 



Stem 2 to 3 feet high, corymbosely branched, often purplish. Leaves 1 to 2 or 3 

 inches long, sometimes quite narrow, mostly entire. Flowers in dense flattish 

 heads. Bracts imbricated, linear-lanceolate, sharply acuminate, rigid, hirsute- 

 ciliate. Corolla reddish white, with dark purple dots. Stamens scarcely as long 

 as the corolla. 

 Hab. Borders of thickets; old fields, &c.: frequent. Fl. Aug. Fr. Sept. 



4. P. linif olilim, Pursh. Stem smoothish ; leaves narrowly 

 linear, crowded, 3- to 5-nerved; cymules compact, hemispherical, 

 terminal. 



FLAX-LEAVED PYCXANTHEMUM. Virginia Thyme. 



Stem 1 to 2 feet high, often purple, with erect branches forming a compact corymb. 

 Leaves % an inch to 2 inches long, often in small axillary fascicles. Bracts im- 

 bricated, ovate-lanceolate, acuminate, rigid, pubescent-ciliate. Corolla white, or 

 slightly tinged with red, and dark purple dots within. Stamens a little exserted. 

 Hab. Thickets; exsiccated swamps : frequent. Fl. July. Fr. Sept. 



288. ORIGANUM, L. 



[Gr. Oros, a mountain, and Ganos, delight ; alluding to its native locality.] 

 Calyx ovoid-campanulate, about 13-nerved, nearly equally 5-toothed, 

 or bilabiate with the upper lip entire or 3-tootned, the lower lip 2- 

 toothed, truncate, or wanting. Corolla sub-bilabiate; upper lip 

 emarginate; lower lip longer, 3-lobed and spreading. Stamens 

 exserted, somewhat didynamous ; anther-cells diverging, or divari- 

 cate. Mostly perennials : flowers in dense corymbose clusters, or ob- 

 long spikes, imbricated with colored bracts. 



1, 0. vulgcire, L. Corymbosely branched at summit ; leaves round- 

 ish-ovate ; flowers in corymbose-paniculate clusters ; bracts lance- 

 ovate, longer than the calyx. 



COMMON ORIGANUM. Wild Marjoram. 



Stems 12 to 18 inches high, usually growing in bunches. Leaves % an inch to 

 an inch long, entire, dark green above, paler beneath ; petioles }/ to near % an 

 inch in length. Calyx pubescent, with 5 equal lance-ovate segments; throat hairy . 

 Corolla pale purple. 

 Hab. Sandy banks. Nat. of Europe. Fl. July. Fr. Sept. 



Obs. This foreigner is yet rare, in Chester County. It is plenti- 

 ful on the road side, about 7 miles west of Philadelphia. 



2. 0. MAJORANA, L. Somewhat branched; leaves elliptic-obovate ; 



