CYPERACEA: 173 
straight, stem trigonous; peat-bogs, frequent. 4. Scheuch- 
gerz, Hoppe; heads dark grey, perianth-bristles, straight, 
stem cylindrical; high, frequent. 
6. RHYNCHOSPORA, Vahl. 
Flowers unisexual or bisexual; spikelets terete, in 
axillary and terminal panicles or corymbs; bristles 6 or 
more. 
R. alba, Vahl; spikelets white, stamens 2; FX. fusca, 
R. and S.; spikelets dark brown, stamens 3; bothin bogs, 
frequent. 
7, CUCADIUM, KR. Bt. 
Flowers mostly bisexual; bristles 0; spikelets in 
panicles or cymes; leaves rigid, glaucous. 
C. Mariscus, Br. (germanicum, Schrad.); stem 2-3 
ft., leaves denticulate, with very sharp edges and keel; 
marshes; Switzerland, Jura, Pyrenees; not common. 
8. SCHENUS, L. 
Spikelets in compressed terminal bracteate heads; 
flowers very few, bisexual; bristles I-6; stamens 3. 
S. nigricans, L.; stem 12-18 in, spikelets 5-10, 
blackish-brown; S. ferrugineus, L.; stem 6-12 in., 
spikelets 2-3, rusty-brown; both frequent in bogs. 
9. ELYNA, Schrad. 
Spikelets 2-flowered in a terminal spike; each flower 
with a large scale-like bract at its base, unisexual. 
E. spicata, Schrad. (Bellardi, Degl.); leaves semi- 
