ORDER XCI. LABIATE. 



465 



parallel. Flowers in heads, surrounded by a many-leaved 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. 2f . July — Aug. Mountains. 2 — 3 feet. 



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'cexs, (T. &, G.) Leaves ovate-lanceolate, subserrate, gla- 

 brous above, hoary beneath. Verticeh cymose, lax. Achenia bearded 

 at the apex. 



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

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

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

 taceous. Calyx tomentose, striate. Corolla pubescent on the inner 

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

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



5. P. Loomis'ii, (Xutt.) Leaves ovate, subserrate, acute, glabrous 

 above. Verticeh cymose, mauy-bracted, bracts lanceolate, acuminate, 

 white. Floicers spotted. 



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

 petiolate, 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. Flowers 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. Virgix'icum, (Nutt.) Stem erect, pubescent, branching. Flowers 

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

 Bracts villous, acuminate. Calyx villous. Corolla pubescent 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. Corolla pu- 

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



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

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

 smooth, lanceolate. Calyx covered with resinous dots. Corolla pubes- 

 cent Stamens exserted. — Purple. If. July — Aug. Mountains. I — 2 

 feet 



12. P. monta'xum, (Mich.) Stem glabrous, purple. Leaves oval-lance- 

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

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

 Sta?nens exserted. Seed hairy at the summit. — Purple, spotted. 2£. 

 Julv — Aug. Mountains. 1 — 2 feet 



20* 



