346 96. CYPERACEZ. 
hypogynous, definite, with sometimes a row of bristles or abortive 
filaments. Anth. erect, entire at the apex. Ovary l-celled, 1 
ovule at its base, often surrounded by bristles. Style simple, 
trifid or bifid. Embryo inclosed within the base of the albumen. 
—L. with entire sheaths—For figures of the genera see G. F. G. 
Monocotyl. ii. 
Tribe I. CVPEREA. F'. perfect. Gl. 2-ranked. Perigone 0. 
1. Cyperus. Spikelets 2-ranked. Gl. of } valve, numerous, 
keeled, nearly all with flowers. Bristles 0. 
2. Scua@nus. Spikelets 2-ranked, 2—4-flowered. Gl. 6—9, 
lower ones smaller, empty. Bristles few or 0. 
Tr. If. SCIRPEAs. FI. perfect. Gl. imbricated on all sides. 
Perigone 0. 
* Lower gl. empty or smaller. 
3. Curapium. Spikelets 1—2-flowered. Gl. 5 or6. Bristles 0. 
Nut with a thick fleshy coat, tipped with the slender base of 
the style. 
4. Ruyncuospora. Spikelets few-flowered. Gl. 6 or 7. 
Bristles about 6. Nut compressed convex on both sides 
crowned with the dilated base of the style. 
** Lowest gl. empty or larger, sometimes all fertile. 
+ Bristles scarcely equalling the gl. or 0. 
5. Eveocuarts. One or 2 lowest gl. larger, empty. Bristles 
3—6. Nut compressed, crowned with the persistent dilated 
base of the style. 
6. Scirpus. Glumes nearly equal, or 1 or 2 lowest larger 
empty. Bristles about 6 or 0. Nut plane-convex or tri- 
gonous, tipped with the filiform not dilated base of the style. 
7. Biysmus. Two lowest gl. largest and empty. Bristles 
3—6. Nut plane-convex, tipped with the not-dilated base 
of the style. Spzkelets bracteated, alternate, forming a close 
distichous compound terminal spike. 
tt Bristles ultimately much exceeding the glumes. 
8. ErropHoruM. Glumes nearly equal, lowest sometimes 
empty. Bristles ultimately silky. Nut trigonous. 
Tr. Wl. ELYNE. Fi. diclinous. Perigone 0 or formed of 
1 or 2 scales. 
9. Kopresia. Spikes aggregate. Lower fl. fem., perigone 
