Rynchospora.| CYPERACEZ. 321 
dense masses in the wettest portions of the bog and some- 
times almost filling the slight depressions where the surface 
is composed of Sphagnum floating on mud. Even when not 
in flower the presence of this plant is betrayed at a con- 
siderable distance by the tawny colour of the stems. 
In Great Britain the Rynchospora occurs at intervals along 
the south and west coasts of England and Wales and in two 
counties on the west side of Scotland. On the Continent it 
is very widely distributed, ranging from Norway and Russia 
to Austria and Italy ; while in North America it extends from 
New Brunswick and Delaware westward to the Great Lakes 
and Michigan. 
R. alba Vahl. 
Districts I. II. TI. IV. V. VI. VIL. VIII. IX. 
Native. Wet bogs and moors. Common and loeally abun- 
dant. Peren. July—August. Calcifuge A. 
From sea-level, to 1,050 feet on the Reeks (Hart), to the 
same height in the Slaheny valley, to 1,075 feet on the 
Coomacarrea Mountains and to 1,175 feet near the summit 
of the old Kenmare-Glengarriff road (R.W.S.). 
First record in 1825: Mackay Cat. 
SCHGNUS Linn. 
S. nigricans Linn. 
Districts I. Il. ITI. IV. V. VI. Vil. VI. — 
Native. Marshy ground, wet moorlands, lake margins, banks 
near the sea, &c., Common and locally abundant, except 
in the extreme north, where it is either very rare or absent. 
Peren. June—July. 
From sea-level, to 1,200 feet on the Reeks and to 1,400 feet 
on Beenoskee west of Castlegregory (Hart). 
First record in 1806: Mackay Rar. 
This is a plant of most varied habitats. It appears to 
thrive as well in brackish marshes as in fresh-water swamps, 
on lowland as on upland moors ; it is abundant also on the 
wet flats and stony margins about the Killarney Lakes and 
on steep grassy slopes by the sea, as near Carrahane strand, 
&c., west of Ardfert. 
CLADIUM P. Brown. 
C. Mariscus R. Br. C. jamaicense Crantz. 
Districts I. IL Il. IV. V. VI. — VII. — 
Native. Margins of lakes, pools, sluggish streams and in 
wet marshy places. Rather common in the south and about 
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