CYPERACE^ 171 



places, very common. H. 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. H. 

 Lereschii, Thorn.; annual, spikelets few-flowered, achenes 

 black ; Switzerland, very rare (Lausanne). 



3. SciRPUS, L. 



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 : — 

 5. alpinus, Schleich. ; stem 2-3 in., nearly leafless, spikelet 

 solitary, terminal, perianth o, stigmas 3 ; very high, rare ; 

 Engadine, Zermatt, Simplon, Mont Cenis. .S. mucrona- 

 tus, L. ; stem angular, 1^-2^ ft., spikelets sessile, bristles 

 present ; bogs, rare. S. supinus, L. ; stem 2—8 in., cylin- 

 drical, spikelets in dusters, perianth-bristles o ; very 

 rare ; Lake of Geneva, Lombardy. 



The following are British species : — 



A. Spikelets large; stem leafless: — S. lacustris, L., 

 Bulrush (including Taberncemontani, Gmel., and carina- 

 tus, Sm.); stem 1-8 ft., cymes terminal, branched; 5. 

 triqueter, 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 : 

 — 5. maritimus, L. ; stem 1-3 ft., leaves \ 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. 



