02 KHAMEUIACK.E. (KHATANV I'-AMILV.) 



^1. P. alba, Null. SlLiiis srviTjil fi-Diii ;i suincwliiit wooily rudt, erect or 

 asi-eiitlinjr, aii^uhir, at lengtli briiiiched above; leaves linear, uarrowed toward 

 the liiuso ; spike Icjiig-pediuRled, linear-lanceolate, acuminate ; tiower« sliort- 

 j)edicelled ; wings oval, rallier longer than tlie caj)sule ; lobes of the caruncle 

 shorter than the oblong-obovate very hairy seed. — Alal)aina and westward. 



— Stems h° - i^ high. Spikes V-'3' long. Flowers white. IJracts deciduous. 

 '2-2. P. leptocaulis, Torr. & Gray. Annual; stem very slender, lirancli- 



ing, l°-:i^ iiigli ; leaves J^' long, scattered , linear, spikes very slender, 2'- 3' 

 long, loosely Howered; wings i)ale purjile, elliptical-obovate, as long as 

 tlie oWoug capsule; seeds very hairy; caruncle minute. — Missi.ssippi, and 

 westward. 



* * Leares whorled : flowers small, greenish or white, in slender sjilkes. 



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

 si)aringlv branched; leaves 4-5 in a wliorl, the lower ones oblong-obovate, 

 till- u\>\)iM- lanceolate and scattered ; spike linear, loug-peduncled ; wings obo- 

 vate, as long as tiie capsule; caruncle iialf as long as the oblong-obovate 

 curved and very hairy seed. — Kich calcareous soil, Florida, Georgia, and 

 westward. May -July. ^ — Stems 1° - 2° liigh. Leaves 1' long. Spikes 

 2' -3' long. Flowers white. 



24. P. verticillata, L- Annual ; stems low, 4-augled, much branched ; 

 leaves 4 - 5 iu a whorl, linear, acute, the u])per ones sciittered ; spikes lanceo- 

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

 long as tlie oblong hairy seed. — Dry sandy soil. June - August. — Stem 4' - 

 8' iiigh. Spikes i'- r loug. Flowers greenish white. 



25. P. ambigua, Nutt. Very closely allied to the preceding, bat taller 

 (6' -1.5' iiigh), tlie branches erect; leaves usually broader, only tlie lower 

 ones verticillate ; spikes more slender, more loosely flowered ; wings white. 



— Gravelly hills in the upper districts. May. 



26. P. leptOStachys, Shuttlw. Annual; stems filiform or setaceous, 

 simple, or branched above, straight; leaves 4-5 in remote whorls, narrow- 

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

 se.ssile, smaller than the capsule ; caruncle half as long as the smooth curved 

 davate-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. 19. 



27. P, paucifolia, L. rereunial ; flowering stems erect, simple, leafy 

 at the summit ; loaves large, ovate, alternate, narrowed into a petiole, the 

 lower ones bract-like; flowers (1-3) pedunded, crested, very large; wings 

 obovate ; lobes of the caruncle subulate, varying in length ; seeds hairy ; 

 radical spikes bracted. — Mountains of Georgia and Carolina. May. — 

 Steins 4' -6' high, from a long prostrate base. Flowers %' long, jiurple. 



Order 46. KRAMERTACEiE. (Riiatany Family.) 



Silky-pubescent herbs or shrubs, with diffuse stems, alternate 

 leaves, and ii-regular hj'pogynous purplish flowers, on axillary 2-bracted 



