ORDER 154 CYPERACE^E. 359 



26 O. dissltlflorun Tor. Culm slender, 1 2f, longer than the narrow le.ives; iuvol. 

 'i-leaved : rays 3 5; spike very slender and pointed, 6 9", separate tin the rachis ; 

 glume* 5 7, lance-oblong, acute ; achenia brown, 3-angled. V. Tenn. to La. 



27 C. Micliauxiaiius Schlt. Culm sharply 3-angled, 6 20' ; umbel 6-10-rayeil, 

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

 ohlon<r, overlapping, appressed ; achenia ovoid, 3-angled. y. Swamps, M. and S. 



48 C. Engelmauni Steud. Spikes very slender, with the 5 12 glumes remote, and 

 the achenia oblong-linear. Otherwise like No. 27. 11 Sandy swamps, W. and S. 



29 <'. tetragonus Ell. Culm acutely rough-3-angled. leaves rough-edged; spile 

 4-anglecl. oblong, 2 3"; glumes 5 7, ovate, veiny : rays 6 12, slender. 11 Dry. S. 



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

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

 3-rtow<Teu. subulate, radiant ; glumes veiny, oblong, acute ; ach. obovoid. 11 Dry. S. 



3 I O. ovularis (Vahl.) Culm b Hi', leaves shorter ; umbel simple ; rays 3" 3', each 

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



32 O. L,a ii caKtrlensis Porter. Culm 1 2^f; leaves linear, long: heads 5 9, oval, 

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

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



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

 1 obovatf, dense head; spikes &', subulate, 1 flowered, soon deflexed. 11 N. J.,and S. 



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



30 <;. Ai.TEKNiFOLius. 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. piimila MX. In tufts, 2 12' high, very slender; heads solitary, rarely triple, 



sessile, oval to oblong; invol. 3-lvd., 1 2' ; spk. very QC, 1-flwd., green. iT) 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; iuvol. dettexed. U Fla 



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

 into a spike, awned below the apex. I'etaloid scales 3, cordate, awned, 

 unguiculate, investing the stipitute acheniiim. n Stems angular, leafy. 

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



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



ovoid, squarrmts with the long recurved awns, 4 7 together in each head. Bo^e. 

 ft. Ittxpiita. Taller, with sheaths and leaves, hispid with white spreading hairs. 



2 F. Ni-irpoideu MX. Culm slender 1 2f, leafless but \vith several sheaths ; spikes 



\--.i, ovoid, 3 5", not squarrous, the short awns erect. Wet, Ga., Fla. 



5. ELEOCHARIS, R. IJr. SPIKKD RUSH Spikes terete. Glumes 

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

 riirid, persistent. Style 2-3-cleft, articulated to the oyary. Acheninm 

 rrowned with a tubercle which is the persistent bulbous base of the style 

 Uosily y, ~. Stems leafless. Spike solitary, terminal. 



$ Spike terete, cylindrical, not thicker than the tall (2 41) culm., .(a) 



% Spike tereie (glumes spirally imbricated), thicket than the culm.. .(6) 



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



