ORDER 154 C YPERACEJE. 359 



26 C. dissitiflorus Tor. Culm slender, 1 2f, longer than the narrow leaves ; invol. 

 3-leaved ; rays 3 5 ; spike very slender and pointed, 69", separate on the rachis ; 

 glumes 57, lance-oblong, acute ; achenia brown, 3-angled. it Term, to La. 



27 C. Jtticliauxianus Schlt. Culm sharply 3-angled, 620'; umbel G-10-rayed, 

 simple or compound ; spikes crowded in oblong clusters, 3", tawny ; glumes 510, 

 oblong, overlapping, appressed ; achenia ovoid, 3-angled. if. Swamps, M. and S. 



28 C. Eiigelmaimi Steud. Spikes very slender, with the 5 12 glumes remote, and 

 the achenia oblong-linear. Otherwise like No. 27. V. Sandy swamps, W. and S. 



29 d tetragonus Ell. Culm acutely rough-3-angled. leaves rough-edged; spike 

 4-angled, oblong, 2 3" ; glumes 5 7, ovate, veiny ; rays 6 12, slender, if. Dry. S. 



30 C. cchinatus (Ell.) Culm 10' 2f, the leaves still longer, involucre 5-6-leaved, 

 very long ; umbel simple, rays 812, each with a globular cluster ; spikes 3", about 

 3-flowered, subulate, radiant ; glumes veiny, oblong, acute ; ach. obovoid. it Dry. S. 



31 C. ovularis (Vahl.) Culm 6 16', leaves shorter ; nmbel simple; rays 3" 3', each 

 with a dense oval head ; spikes If", 1-3-flowered, very many. if. Bogs. M., W., S. 



32 C. Lancastriensis Porter. Culm 1 2f; leaves linear, long: heads 5 9, oval, 

 on as many slender rays; spikes subulate, 4 6", soon deflexed, glumes about 5, 

 veiny, obtuse, tawny, very acute, with about 3 linear achenia. is. Lancaster Co., Pa. 



33 C. retrofractus (Vahl.) Culm 2 3f, leaves shorter, broad ; rays 1 6', each with 

 1 obovate, dense head; spikes 3", subulate, 1-flowcred, soon deflexed. H N. J.,and S. 



34 C. uiiiilorus Torr. & Hook. Has hds. oblong, 1' long, spks. closely deflexed. La. 



35 C. ALTEKNIFOLIUS. Greenhouse species from Madagascar. Culm, and leaves, and 

 many-leaved involucre striped with white and green, like Ribbon Grass. 



3. KYLLINGIA, L. Spikes compressed. Scales about 4, the two lowest 

 short and empty, the third only usually with a fertile flower. Sta. 1 3. 

 Style long, 2-cleft. Achenia lenticular. Culms triangular, leafy at base. 

 Heads sessile, solitary or aggregated, involucrate, odorous. Aug. 



1 K. pumila MX. In tufts, 2 12' high, very slender; heads solitary, rarely triple, 



sessile, oval to oblong; invol. 3-lvd., 1 2' ; spk. very Co, 1-flwd., green. (T) W. and S. 



2 K. sesquiflora Torr. Root creeping; culms 6 12'; heads mostly triple, oval to 



oblong, the lateral quite small; spk. densely packed, white; invol. deflexed. U Fla. 



4. FUIRENA, Rotboll. CLOT-GRASS. Glumes imbricated on all sides 

 into a spike, awned below the apex. Petaloid scales 3, cordate, awned, 

 uuguiculate, investing the stipitate achenium. 2 Stems angular, leafy. 

 Spikes solitary or in heads, pedunculate, (brown). 



1 F. sqiiarrosa MX. Culm 1 2f, with several joints and sheathing flat Ivs. ; spks. 



ovoid, squarroits with the long recurved awns, 47 together in each head. Bogs. 

 /3. /itspfdtt. Taller, with sheaths and leaves, hispid with white spreading hair?. 



2 F. scirpoidea MX. Culm slender, 1 2f, leafless but with several sheaths ; spikes 



1 3, ovoid, 3 5", not equarrous, the short awns erect. Wet, Ga., Fla. 



5. ELEOCHARI8, R. Br. SPUKED RUSH. Spikes terete. Glumes 

 imbricated all around. Bristles of the perianth (setae) mostly 6 (3 to 12). 

 rigid, persistent. Style 2-3-cleft, articulated to the ovary. Achenium 

 crowned with a tubercle which is the persistent bulbous base of the style. 

 Mostly y, &, Stems leafless. Spike solitary, terminal. 



Spike terete, cylindrical, not thicker than the tall (2 4f) culm. . .(a) 



| Spike terete (glumes spirally imbricated), thicker than the culm... (ft) 



Spike? flat, glumes few, in 2 or 3 rowp, often proliferous. Culm capillary., ,(*) 



