358 96. CYPERACE^:. 



equal 1. at the base. Glumes fuscous with green keels. Little 

 Chelsea, Middlesex. Shalford Common. Surrey. Guisborough 

 Moor, Yorkshire. Jersey. A. VIII. IX. E. 



2. SCHCENUS Linn. Bog-rush. 



1. S. nigricans (L.); st. round naked, spikelets 5 10 col- 

 lected into a terminal roundish head overtopped by the lower 

 bract, gl. scabrous at the keel. E. B. 1121. St. 40. 9. Root 

 of strong black fibres. St. 812 in. high, clothed at the base 

 with blackish-brown smooth shining scales some of which ter- 

 minate in setaceous erect leaves which are shorter than the stem. 

 Bristles variable in number, short, rough with upward spines. 

 Stigmas 3. Anth. terminating in a point. Gl. dark-brown or 

 black. Turfy bogs. P. VI. 



Tribe II. Scirpea. 



3. CLADIUM Pat. Br. Sedge. 



1. C. Mariscus (R. Br.) ; panicles lateral and terminal repeat- 

 edly compound, spikelets capitate, st. roundish leafy smooth, 1. 

 rough on the margins and keel. E. B. 950. Root creeping. 

 St. 3 4 feet high. L. very long, rigid, narrowed and triquetrous 

 towards the end, the margins and keel with fine but very acute 

 serratures. Fl. in each spikelet 1 3, but usually only one nut 

 is produced. Bogs and fens, rare. P. VII. Common Sedge. 



4. RHYNCHOSPORA Vahl. 



1. R. alba (Vahl) ; spikelets in a compact corymb about as 

 long as the outer bracts, stam. 2, bristles with declining teeth, 

 base of the style without teeth. E. B. 985. St. 40. 7- Root 

 slightly creeping. St. 6 12 in. high. L. narrowly linear. 

 Spikelets whitish. Bristles 9 12. Filaments slender. )3. sor- 

 dida; spikelets brownish, in small oval clusters often overtopped 

 by the outer bracts. Turfy bogs. P. VII. 



2. R. fusca (Sm.) ; spikelets in an oval head considerably 

 shorter than the outer bracts, stam. 3, bristles with ascending 

 teeth, base of the style with erect teeth. E. B. 1575. St. 40. 6. 

 Root creeping extensively. St. 6 8 in. high. L. nearly fili- 

 form. Spikelets brown. Bristles 6. Filaments dilated. Bogs, 

 rare. South-west of England. Ireland. P. VII. VIII. E. I. 



5. ELEOCHARIS R. Br. 



1. E. palustris (R. Br.); spikes terminal solitary oblong, 

 glumes rather acute, lowest -^-surrounding the spike, stigmas 2, 



