(lIII.KWORT FAMILY.) 85 



kind showy and perfect, borne in a loose terminal raceme, the other imperfect, 

 but fruiting, in radical (rarely axillary) spikes; wings obovatc ; caruncle half 

 as long as the obovatc very hairy seed. (P. rubella, Mulil.) Wet or dry 

 sandy ban-ens, Florida to Mississippi, and northward. May and June. (2) 

 Stems 6'- 12' high, very leafy. Racemes 2' -6' long. Flowers purple. 



17. P. Senega, L. (SENECA SNAKEROOT.) Stems several from a thick 

 woody root, erect or ascending, simple or branching above ; leaves numerous, 

 lanceolate, the upper ones acute (!' long) ; spike cylindrical, pedunclcd; wings 

 round-obovate, as long as the capsule ; lobes of the caruncle linear, as long as 

 the obovatc hairy seed. Var. I.ATIFOLIA, Torr. & Gray. Stem taller ( 1 - 1 i) ; 

 leaves large (2' -4' long), ovate or ovate-lanceolate, acute or acuminate at each 

 end. Dry rocky woods in the upper districts of North Carolina and northward ; 

 the variety in Tennessee, and northward. May and June. 1J. Stems 8' - 12' 

 high. Spikes 1 '- H' long. Flowers greenish-white. 



18. P. alba, Nutt. Stems several from a somewhat woody root, erect or 

 ascending, angular, at length branched above ; leaves linear, narrowed toward 

 the base, acute, or lowest ones obtuse ; spike long-peduncled, linear-lanceolate, 

 acuminate ; flowers short-pedicellcd ; wings oval, rather longer than the capsule ; 

 lobes of the caruncle shorter than the oblong-obovate very hairy seed. (P. bicolor, 

 A'unth.) Interior of Alabama, Buckley, and westward. Stems ^-lhigh. 

 Spikes 1'- 3' long. Flowers white. Bracts deciduous. 



* * Leaves whorled : flowers small, greenish or white, in slender spikes. 



19. P. Boykinii, Nutt. Perennial; stems numerous, angled, simple or 

 sparingly branched ; leaves 4 - 5 in a whorl, the lower ones oblong-obovate, the 

 upper lanceolate and scattered ; spike linear, long-peduncled ; wings obovate, as 

 long as the capsule ; caruncle half as long as the oblong-obovate curved and 

 very hairy seed. Rich calcareous soil, Florida, Georgia, and westward. May- 

 July. 1J. Stems 1- 2 high. Leaves 1 ' long. Spikes 2' -3' long. Flowers 

 white. 



20. P. verticillata, L. Annual; stems low, 4-angled, much branched ; 

 leaves 4 - 5 in a whorl, linear, acute, the upper ones scattered ; spikes lanceolate ; 

 wings roundish, as long as the capsule ; lobes of the caruncle half as long as the 

 oblong hairy seed. Dry sandy soil, Florida to Mississippi, and northward. 

 June -Aug. Stem 4' - 8' high. Spikes i' - 1' long. Flowers greenish-white. 



21. P. leptOStachys, Shuttl. Annual; stems filiform or setaceous, sim- 

 ple, or branched above, straight ; leaves remote, 4-5 in a whorl, narrpw-linear 

 or filiform, acute ; spike linear, long-peduncled ; wings oval, nearly sessile, 

 smaller than the capsule ; caruncle half as long as the smooth curved clavate- 

 obovate seed. Dry sand hills, Florida. May- August. Stems 10'-15' high. 

 Flowers greenish. 



3. Flowers axillary, and with imperfect radical ones, as in No. 16. 



22. P. paucifolia, L. Perennial ; flowering stems erect, simple, leafy at 

 the summit ; leaves large, ova(e, alternate, narrowed into a petiole, the lower 

 ones bract-like ; flowers (1-3) pedunclcd, crested, very large ; wings obovate; 



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