MONOPETALOUS EXOGENOUS PLANTS. 429 



opposite or (the upper) alternate entire leaves, and showy 

 purple or white flowers in terminal panicled cymes. 



stems herbaceous, erect or ascending. 



* Style long^ JUiform ; calyx-teeth lanceolate-subulate, not awn-pointed ; 

 lobes of the corolla entire. 



P. GLABERRIMA, L. Smooth ; stem erect or ascending, 

 sparingly branched above; leaves lanceolate or linear, 

 acute, the lower tapering to the base, the upper broader 

 and rounded at the base ; cymes usually 3, terminal, few- 

 flowered ; calyxAohQ^ lanceolate, acute ; corolla large, with 

 the lobes wedge-obovate. July. Stem l°-2° high ; leaves 

 3'-4' long ; pedicels as long as the calyx ; corolla 1' long, 

 pale purple. 



*♦ style short, scarcely longer than the ovary ; calyx-teeth linear-subulate, tapering 

 into an awn-like point ; lobes of the corolla often notched ; stems pubescent. 



P. piLOSA, L. Pubescent or villous ; stem erect, mostly 

 branching; leaves linear, or linear-lanceolate, spreading, 

 distant, acute, the uppermost rounded at the base ; cymes 

 corymbose, loose-flowered ; calyx-iQQt\i -f as long as the 

 tube of the corolla, prolonged into long and spreading 

 bristle-like points, hairy. (P. aristata, Michx.) April and 

 May. Stem rather slender, l°-l|-° high; leaves 2 -4' long ; 

 corolla f ' long, purple. On the Trinity River. 



P. Floridana, Benth. Stem erect, simple, closely pubes- 

 cent ; leaves uniform, linear-lanceolate, acute, spreading or 

 recurved, the upper ones often alternate ; cymes crowded or 

 corymbose ; calyx-teeili spreading, somewhat bristle-point- 

 ed, glandular-pubescent, J- J as long as the tube of the 

 large corolla. Dry open woods. Middle Florida. May. 

 Stem lJ°-2° high ; leaves 2-3' long; corolla V broad, pale 

 purple, the lobes round-obovate and entire. 



sterna shrubb'j, tufted, creeping ; leaves subulate, rigid, leafy in the axils ; style 



short. 



P. suBULATA, L. Pubescent ; flowering stems erect ; 



