LABIATE. (MINT FAMILY.) 377 



+ *~ H- Cymes capitate, In compact corymbose clusters: bracts shorter than the 

 flowers : stem and rigid entire leaves sjnoulhisk. 



9. P. lanceolatum, Pursh. Stem branched ; leaves lanceolate or linear- 

 lanceolate, acute, rounded at the base ; cymes numerous, pubescent ; bracts 

 ovate-lanceolate ; calyx teeth short, triangular. Dry soil iu the upper dis- 

 tricts. August - Sept. Stem 2 high. Leaves 1' - 2' long. 



10. P. linifolium, Pursh. Stem branched ; leaves very numerous, linear, 

 sessile; cymes smootliish ; bracts linear, acute ; calyx teeth lanceolate-subu- 

 late, rigid, acute. 'Dry soil. August - Sept. Stem 2 high. 



11. P. nudum, Nutt. Smooth; stem simple or corymbose at the sum- 

 mit, straight ; leaves sessile, ovate-oblong, obtuse, rounded at the base ; cymes 

 smooth ; exterior bracts narrow-lanceolate, the inner short, subulate ; calyx 

 teeth short, triangular-lanceolate, and, like the corolla, pubescent. Low 

 pine barrens, Alabama and Florida. August -Sept. Stem 2 high. Leaves 

 f- I' long. 



M_ H_ 4_ s_ Cymes axillary and terminal, large, denser/towered: bracts dilate. 



12. P. montamim, Michx. Stem slender, smooth, simple or branched ; 

 leaves smooth, ovate-lanceolate, serrate, acute, tapering into a short petiole, 

 the lowest rounded at the base ; cymes globose, the upper ones closely sessile ; 

 bracts numerous, ciliate ; the exterior ovate, very acute, as long as the flowers, 

 the inner ones linear; calyx teeth short, acute ; ovary bearded. Mountains 

 of North Carolina. July - August. Stem 1- 3 high. Leaves 2' -3' long. 



7. COLLINSONIA, L. HORSE BALM. 



Calyx obovate, enlarged and deflexed in fruit, 2-lipped ; the upper lip flat- 

 tened, truncate, 3-toothed, the lower 2-cleft. Corolla funnel-shaped, 2-lipped, 

 dilated at the throat ; the four upper lobes equal, tho lowest larger, declining, 

 toothed or fimbriate. Stamens 2 or 4, long-exserted, spreading: anther cells 

 diverging. Nutlets smooth. Strong-scented perennial herbs. Leaves large, 

 coarsely serrate, dotted beneath. Flowers yellowish, opposite, in racemes or 

 panicles. Petioles tumid at the base. 



* Fertile stamens 2. 



1. C. Canadensis, L. Nearly smooth ; leaves ovate or oblong-ovate, 

 acuminate, sharply serrate, acute, rounded or cordate at the base, long-peti- 

 oled, the uppermost smaller, sessile ; panicle elongated ; bracts minute, very 

 acute ; flowering calyx very small, the upper lip much shorter than the lower, 

 with subulate teeth; corolla 4 times as long as the calyx, yellowish. TCich 

 shaded soil. Sept. Stem 2- 4 high. Leaves 4'- 9' long. Corolla 3" - 5" 

 long. 



Var. punctata, Gray. Generally larger, and more pubescent ; leaves ob- 

 tusely serrate and more plainly dotted beneath ; inflorescence glandular. 

 Georgia to North Carolina, near the coast. Sept. 



2. C. SCabriuscula, Ait. Stem slender, branching, glandular-pubescent 

 above, 1- 2 hi^h ; leaves small (l'-2 / long), ovate, acute or round at the 

 base, coarsely serrate, smooth, or slightly scabrous above ; inflorescence gland- 



