CYPERACE.E. (SEDGE FAMILY.) 567 



\ les Terminated by a single head, involucrate by some outer empty bracts. 

 Flowers, also the tips of the bracts, etc., usually white-bearded or woolly. 

 (Name compounded of epiov, wool, and Kav\6s, a stalk, from the wool at the 

 base of the scape.) Our species are all stemless, wholly glabrous excepting 

 at the base and the flowers, with a depressed head and dimerous flowers. 



1. E. decangulare, L. Leaves obtuse, varying from linear-lanceolate to 

 linear-awl-shaped, rather rigid; scapes 10- 12-ribbed (1-3 high) ; head hemi- 

 spherical, becoming globular (2-7" wide); scales of the involucre acutish, 

 straw-color or light brown; chaff ( bracts among the flowers) pointed. Pine- 

 barren swamps, N. J. to Fla. July - Sept. 



2. E. gnaph.al6d.es, Michx. Leaves spreading (2 - 5' long), grassy-awl- 

 shaped, rigid, or when submersed thin and pellucid, tapering gradually to a 

 sharp point, mostly shorter than the sheath of the IQ-ribbed scape ; scales of 

 the involucre very obtuse, turning lead-color ; chaff obtuse. Pine-barren 

 swamps, N. J. to Fla. 



3. E. septangulare, Withering. Leaves short (1 - 3' long), awl-shaped, 

 vellucid, soft and very cellular ; scape 4 - 7-striate, slender, 2-6' high, or when 

 submersed becoming 1-6 long, according to the depth of the water ; chaff 

 acutish ; head 2 - 3" broad ; the bracts, chaff, etc., lead-color, except the white 

 coarse beard. In ponds or along their borders, Newf . to N. J., west to Ind., 

 Mich., and Minn. July, Aug. (Eu.) 



2. PJEPALANTHUS, Martius. 



Stamens as many as the (often involute) lobes of the funnel-form corolla of 

 the sterile flowers, and opposite them, commonly 3, and the flower ternary 

 throughout. Otherwise nearly as in Eriocaulon. (Name from iraurd\i), dust 

 or flour, and Hvdos, flower, from the meal-like down or scurf of the heads and 

 flowers of many South American species.) 



1. P. flavidulus, Kunth. Tufted, stemless; leaves bristle-awl-shaped 

 (V long); scapes very slender, simple, minutely pubescent (6-12' high), 5- 

 angled ; bracts of the involucre oblong, pale straw-color, those among the flow- 

 ers mostly obsolete ; perianth glabrous ; sepals and petals of the fertile flowers 

 linear-lanceolate, scarious-white. Low pine-barrens, S. Va. to Fla. 



3. LACHNOCAULON, Kunth. HAIRY PIPEWORT. 



Flowers monoecious, etc., as in Eriocaulon. Calyx of 3 sepals. Corolla none ! 

 Ster. Fl. Stamens 3 ; filaments below coalescent into a club-shaped tube around 

 the rudiment of a pistil, above separate and elongated ; anthers 1 -celled ! Pert. 

 Fl. Ovary 3-celled, surrounded by 3 tufts of hairs (in place of a corolla). Stig- 

 vnas 3, two-cleft. Leaves linear-sword-shaped, tufted. Scape slender, bearing 

 a single head, 2 - 3-angled, hairy. (Name from \dx^os, wool, and Kav\6s, stalk.) 



1. L. Michaiixii, Kunth. Low pine-barrens, Va. to Fla. 



ORDER 128. CYPERACE^B. (SEDGE FAMILY.) 



Grass-like or rush-like herbs, with fibrous roots, mostly solid stems (culms), 

 closed sheaths, and spitced chiefly %-androus flowers, one in the axil of each 

 qfthe glume-like imbricated bracts (scales, glumes), destitute of any perianth, 



