ORDER XCI. — LABIAT.E. 465 



parallel. Flowers in heads, siiiToiiiidecl by a niany-lcaved in- 

 volucre. 



1. P. arista'tum, (Mich.) Stem square, pubescent, much branched. 

 Leaves lanceolate-ovate, slightly serrate, on short petioles, whitish. 

 Floicers in 1 or 2 sessile whorls, and a terminal head ; bracts awned. 

 Calyx with the segments terminated by long awns. Corolla glabrous, 

 small. — White. %. July — Aug. Mountains. 2 — 3 foet. 



2. P. hyssopifo'lium, (Benth.) Stem rigid. Leaves subsessile, oblong- 

 linear, nearly entire, obtuse, nearly glabrous. Calyx scarcely bilabiate. 

 12 — 18 inches. 



3. P. ALBEs'cENS, (T, &, (y.) Lcaves ovate-lanceolate, subserrate, gla- 

 brous above, hoary beneath. Verticels cymose, lax. Achcnia bearded 

 at the apex. 



4. P. inca'num, (Mich.) Stem quadrangular, pubescent toward the 

 summit, glabrous at the base. Leaves opposite, oblong, ovate, acute, 

 pubescent, hoary. Floivers in lateral and terminal heads. Bracts se- 

 tact'ous. Calyx tomentose, striate. Corolla pubescent on the inner 

 surface. Stamens exserted. Seeds rugose. — Yellow, spotted with pur- 

 ple, y. Aug. — Sept. In dry fertile soils. 3 — 6 ft. Wild Basil. 



5. P. LooMis'ir, (Nutt.) Leaves ovate, subserrate, acute, glabrous 

 above. Verticels cymose, many-bracted, bracts lanceolate, acuminate, 

 white. FUncers spotted. 



6. P. tul'lia, (Benth.) Leaves ovate or oblong, acute, subserrate, 

 peiiolate, villous-pubescent. Calyx bilabiate, teeth nearly equal, with 

 subulate awns. — Whitish. 



7. P. du'bium, (Dr. A. Gray.) Stem pubescent. Leaves lanceolate, 

 acute, nearly entire, petiolate, glabrous. Flowers in verticillate cymes, 

 teeth of the calyx subulate, the two lower ones shorter than the tube. 



8. P. mu'ticum, (Pursh.) Stem erect, branching. Leaves lanceolate, 

 sessile, slightly dentate, glabrous, dotted. Floioers in loose heads. 

 Bracts rather short, acute. Calyx with acute segments, ciliate. Co- 

 rolla pubescent, small. — Whitish. If. July — Aug. Upper districts 

 of Car. and Geo. 1—2 feet. 



9. P. Virgin'icum, (Nutt.) Stem erect, pubescent, branching. Flowers 

 in terminal heads. Lcaves sessile, linear-lanceolate, entire, dotted. 

 Bracts villous, acuminate. Calyx villous. Corolla jiubescent on the 

 outer surface. — White, spotted. If. July — August. Damp lands. 

 2—3 feet. 



10. P. linifo'lium, (Pursh.) Stem erect, glabrous, fastigiately branch- 

 ed. Leaves usually clustered, linear, entire, dotted, acute. Flowers in 

 terminal heads, corymbose. Bracts ovate, awned, ciliate. Coro/Za pu- 

 bescent.— White, spotted. 2f. July— Aug. Mountains. 2—3 feet. 



11. P. NUDUM, (Nutt.) Stem erect, simple, glabrous. Leaves sessile, 

 oblong-ovate, glabrous, entire. Flowers in numerous lieads. Bracts 

 smooth, lanceolate. Calyx covered with resinous dots. 6'oro//rt pubes- 

 cent. Stamens exserted.— Purple. 2f. July— Aug. Mountains. 1—2 

 feet. 



12. P. monta'num, (Mich.) ^;«m glabrous, purple. Xrair.s oval -la nee- 

 olate, serrate, nearly sessile. Flowers in 1 or 2 whorls, and a terminal 

 head. Calyx erect, bracts ciliate. Corolla with the throat pubescent 

 ^/«me«s exserted. Seed hairy at the summit.— Purple, spotted. If. 

 July — Aug. Mountains. 1 — 2 feet. 



20* 



