CYPERACE.E. (SEDGE FAMILY.) 567 



43. C. tenax, Chapm. Culms (10'- 15' high) and rigid channelled 

 leaves rough, bnt not pubescent ; spikes and ovate beaked and less pubescent 

 perigvnia larger ; nut sessile ; otherwise like the preceding, and possibly a 

 stouter form of it. Dry sand ridges, Middle Florida. 



44. C. Pennsylvanica, Lam. Sterile spike single ; fertile spikes 

 mostly 2, ovoid, approximate, 4-6-flowered, the lower one with a short or 

 scale-like colored bract; perigvnia nearly globose, pubescent, abruptly con- 

 tracted into a short 2-cleft beak, longer than the oblong-ovate dark brown 

 scale. Dry woods in the upper districts. Stoloniferous. Culms 1 or less 

 high, shorter than the narrow green leaves. 



45. C. varia, Muhl. Spikes 2-5, the upper contiguous, the lowest often 

 leafy-bracted ; perigvnia acuminate at both ends, about the length of the 

 oblong-ovate pale scale. (C. Emmonsii, Dew.) Dry light soil, chiefly in 

 the upper districts. Culms filiform, commonly longer than the narrow-linear 

 leaves, often Stoloniferous. 



46. C. nigromarginata, Schw. Spikes mostly 3 - 5, few-flowered, the 

 sterile little exceeding the two contiguous fertile ones ; perigvnia oval, trian- 

 gular, slender-beaked, shorter than the black-margined scale ; stigmas 3 ; nut 

 triangular; culms l'-6' high, much shorter than the rather rigid linear 

 leaves. Dry open woods, North Carolina, and westward. 



47. C. Floridana, Schw. Habit and inflorescence like the preceding; 

 scales slightly or not at all discolored ; stigmas 2 or 3 ; perigyuia plano-con- 

 vex ; nut lenticular. Light dry soil, Florida, and westward. 



M- Fertile spikes linear or cylindrical, remote, all, or the lowest, on distinct 



and commonly elongated peduncles. 



= Perif/ynia striated with numerous fine nerves: sterile spike always single. 

 t Perigynia smooth, nearly terete, obtuse or barely pointed : bracts long and leaf- 

 like, : spikes erect. 



48. C. grisea, Wahl. Sterile spike short, sessile; fertile spikes 3-4, 

 linear-oblong, rather loosely flowered (4" -8" long), the upper one nearly ses- 

 sile ; perigvnia oblong-ovoid, pointless, somewhat inflated, twice as long as 

 the white ovate rough-awned scale ; culms smooth, 1 high ; leaves and bracts 

 broadly linear. Low ground, chiefly in the upper districts. 



Var. angustifolia, Boott. Sterile spike long-peduncled ; fertile spikes 

 mostly 3, linear, few-flowered, very remote, the lowest at the base of the culm ; 

 perigvnia 4-8, lanceolate-oblong, 3-angled, alternate and 2-rankecl, pointless 

 and entire at the apex, longer than the ovate rough-awned scale. Dry open 

 woods, Florida. Culms filiform, 8' -12' high. Leaves and bracts linear. 

 Lowest sheaths dark brown. 



49. C. flaccosperma, Dew. Spikes 4 - 5, the sterile short, sessile, the 

 fertile distant, closely many-flowered, leafy-bracted, the lowest long-pedun- 

 cled ; perigvnia oblong, obtuse, twice the length of the ovate awuless scale ; 

 culms 6' -18' high; leaves broadly linear. Rich shaded soil, Georgia, and 

 westward. 



50. C. granularis, Muhl. Sterile spike short, sessile ; fertile spikes 

 3-4, linear-cylindrical, densely mauy-flowered, yellowish, the upper one nearly 



