ORDER 154 CYPERACE^E. 359 



26 . dissitiflorus Tor. Calm slender, 1 2f, longer than the narrow leaves ; invoL 

 3-leaved ; rays 3 5 ; spike very slender and pointed, 6 9", separate on the rachis ; 

 glumes 57, lance-oblong, acute ; achenia brown, 3-angled. y. Tenn. to La. 



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

 pimple or compound ; spikes crowded in oblong clusters, 3", tawny ; glumes 5 10, 

 oblong, overlapping, appressed ; achenia ovoid, 3-angled. y. Swamos, M. and S. 



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

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



29 . 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. 



JO C. ecliinatiis (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-flo\vered. subulate, radiant ; glumes veiny, oblong, acute ; ach. obovoid. if. Dry. S. 



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

 with a dense ova! head ; spikes W, 1-3-flowered, very many, n Bogs. M., W., S. 



32 C. Liancastriensis Porter. Culm 1 2|f: 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. U Lancaster Co., Pa. 



33 C. retrofractus (Vahl.) Culm 2 3f, leaves shorter, broad ; rays 1 G 7 , each with 

 1 obovate, clensii head; spikes 3", subulate, 1- flowered, soon deflexed. it N. J.,andS. 



34 C. uniflorus Torr. & Hook. Has hds. oblong, V long, spks. closely deflexed. La. 



35 C. ALTERNIFOLIUS. 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, 212' high, very slender; heads solitary, rarely triple, 



sessile, oval to oblong ; invol. 3-lvd ., 12' ; spk. very GO, 1-flwd., green. W. and S. 



2 K. sesquiflora Torr. Root creeping; culms 612' ; heads mostly triple, oval to 



oblong, the lateral quite small ; spk. densely packed, white ; invol. deflexed. 2f Fla. 



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

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

 unguiculate, investing the stipitate acheniuin. U Stems angular, leafy. 

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



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



ovoid, squarrous with the long recurved awns, 4 7 together in each head. Bog8. 

 /3. liiftpida. Taller, with sheaths and leaves, hispid with white spreading hairs. 



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



1 d, ovoid, 3 5 r/ , not squarrons, the short awns erect. Wet, Ga., Fla. 



5. ELEOCHARIS, R Br. SPIKED 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. Acheuiuia 

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

 Mostly 2{, ?. 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., .(b) 



$ Spike? flat, glumes few, in 2 or 3 rows, often proliferous. Culm capillary.. .(*! 



