CYPERACE^ 171 



places, very common. H. acicularis^ R. Br. ; stem very 

 slender, almost square, stigmas 3 ; Switzerland, Jura. 

 H. ovatUy R. Br. ; annual, spikelets many - flowered, 

 achenes yellowish ; Switzerland, Jura, very rare. H, 

 Lereschiiy Thom.; 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 : — 

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

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

 Engadine, Zermatt, Simplon, Mont Cenis. 5. mucrona- 

 tus, L. ; stem angular, i J-2J ft., spikelets sessile, bristles 

 present ; bogs, rare. 5. supinuSy L. ; stem 2-8 in., cyHn- 

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

 rare ; Lake of Geneva, Lombardy. 



The following are British species : — 



A. Spikelets large; stem leafless: — 5. lacustrisy L., 

 Bulrush (including Taberncemontaniy Gmel., and carina- 

 tus, Sm.); stem 1-8 ft., cymes terminal, branched; 6*. 

 triqueter, L. {trigonuSj Roth) ; stem triquetrous ; 5. pun- 

 gens , Vahl ; similar but more slender ; all by water-sides. 



B. Spikelets large ; stem leafy ; cymes terminal, leafy : 

 — 5. maritimuSf L. ; stem 1-3 ft., leaves J in. broad, 

 spikelets brown ; by water. vS. sylvaticuSy L. ; stem 

 1-3 ft., leaves flat, cyme very large; moist woods. 



C. Spikelets small, lateral; perianth-bristles o: — 5. 

 setaceuSy L. ; stem very slender, spikelets 1-3 ; ditches. 



