CYPERACE.SE. 
327 
hypogynous, definite. Anth. erect, fixed by the base, entire at 
the apex. Ovary 1 -celled, often surrounded by bristles. Style 
simple, trifid or bifid. — L. with entire sheaths. 
Tribe I. CYPEREJE. Fl. perfect. Glumes 2-ranked. 
1. Cyperus. Spikelets 2-ranked. Glumes of 1 valve, nu- 
merous, keeled, nearly all with flowers. Bristles 0. Pe- 
rigone 0. 
2. Schcenus. Spikelets 2-ranked, 2 — 4-flowered. Glumes 
6 — 9, lower ones smaller, empty. Bristles few or 0. 
Tr. II. SCIRPE^E. Fl. perfect. Glumes imbricated on all 
sides. Perigone 0. 
3. Cladium. Spikelets 1 — 2-flowered. Glumes 5 or 6, the 
lower ones empty and smaller. Bristles 0. Nut with a thick 
fleshy coat, tipped with the slender base of the style. 
4. Rhynchospora. Spikelets few-flowered. Glumes 6 or 7, 
lower ones empty or smaller. Bristles about 6. Nut com- 
pressed convex on both sides crowned with the dilated base 
of the style. 
5. Eleocharis. Glumes fertile, lowermost larger, 1 or 2 of 
the lowest empty. Bristles 3 — 6. Nut compressed, crowned 
with the persistent dilated base of the style. 
6. Scirpus. Glumes fertile, nearly equal, or lowermost larger, 
1 or 2 of the lowest empty. Bristles about 6 or 0. Nut 
plano-convex or trigonous, tipped with the filiform not dilated 
base of the style. 
7. Blysmus. Glumes fertile, outermost the largest and empty. 
Bristles 3 — 6. Style not thickened at the base, persistent. 
Nut plano-convex, tipped with the not-dilated base of the 
style. Spikelets bracteated, alternate, forming a close di- 
stichous compound terminal spike. 
8. Eriophorum. Glumes fertile, nearly equal, lowermost 
sometimes empty. Bristles ultimately much longer than the 
glumes and accompanying the fr., silky. Nut trigonous. 
Tr. III. ELYNEjE. Fl. diclinous. Perigone 0 or formed of 
1 or 2 scales. 
9. Kobresia. Spikes aggregate. Lower fl. fem., perigone 
of 1 scale inclosing the germen and covered by the glume. 
Upper fl. male, without any perianth. 
Tr. IV. CAR1CEJE. Fl. diclinous. Nut completely inclosed 
in the urceolate perigone. 
10. Carex. Fl. in imbricated spikes, each covered by a 
glume. Female fl. with a single urceolate persistent peri- 
