CYPERACEZ 171 
places, very common. WJ. acicularis, R. Br.; stem very 
slender, almost square, stigmas 3; Switzerland, Jura. 
H. ovata, R. Br.; annual, spikelets many - flowered, 
achenes yellowish; Switzerland, Jura, very rare. JZ. 
Lereschiz, Thom.; annual, spikelets few-flowered, achenes 
black ; Switzerland, very rare (Lausanne). 
2) SCIRPUS bk 
Flowers bisexual; spikelets usually collected into 
heads; perianth o or of 3-8 bristles. Tall water or 
smaller marsh plants. 
The only Swiss species which are not British are :— 
S. alpinus, Schleich. ; stem 2-3 in., nearly leafless, spikelet 
solitary, terminal, perianth 0, stigmas 3; very high, rare; 
Engadine, Zermatt, Simplon, Mont Cenis. S. mucrona- 
tus, L.; stem angular, 14-23 ft., spikelets sessile, bristles 
present ; bogs, rare. S. supznus, L.; stem 2-8 in., cylin- 
drical, spikelets in clusters, perianth-bristles 0; very 
rare; Lake of Geneva, Lombardy. 
The following are British species :-— 
A. Spikelets large; stem leafless:—5S. lacustris, L., 
Bulrush (including Zadernemontani, Gmel., and carina- 
tus, Sm.); stem 1-8 ft., cymes terminal, branched; S. 
trigueter, L. (trigonus, Roth); stem triquetrous; S. pun- 
gens, Vahl; similar but more slender; all by water-sides. 
B. Spikelets large; stem leafy ; cymes terminal, leafy: 
—S. maritimus, L.; stem 1-3 ft., leaves 4 in. broad, 
spikelets brown; by water. S. sylvaticus, L.; stem 
1-3 ft., leaves flat, cyme very large; moist woods. 
C. Spikelets small, lateral; perianth-bristles o:—S. 
setaceus, L.; stem very slender, spikelets 1-3; ditches. 
