97. CTPBEACB^. 387 



temate or opposite, l-Teined, pellucid, remotely denticulate. 

 Ovary solitary, axillary, sessile, oWong. Style short. — Deep 

 lakes. A. VUI. S. 1. 



Division III. GLUMIFERiE. 



(Orders XOVH. and XCVIII.) 



Leaves parallel-veined, persistent. Floral envelopes imbri- 

 cate, bractlike. 



Order XCVII. CYPEEACE^. 



Fl. perfect or unisexual, eacb from the axil of a scale (or 

 glume) imbricate on a common axis. Perianth 0, or rarely mem- 

 branous. Stam. hypogynous (3 or rarely 2 in our plants), with 

 sometimes a xow of bristles or abortive hlaments. Anth. erect, 

 entire at the apex. Ovary l-ceUed, 1 ovule at its base, often 

 surrounded by bristles or enclosed in a bottle-shaped perianth. 

 Style simple, trifld or bifid. Embryo enclosed within the base 

 of the albumen. — L. with entire sheaths. 



Tribe I. CrP^iJ-E/S'. Fl: perfect. G1.2-ranked. Perianth 0. 



1. Cypeeus. Spikelets 2-ranked, many-flowered. Gl. of 

 1 valve, many, keeled, nearly all with flowers. 



2. ScHCENUS. Spikelets 2-ranked, 2 — 4-flowered. Gl. 6 — 9 ; 

 several lower ones smaller, empty. Bristles few or 0. 



Tr. II. 8CIRPEM Fl. perfect. Gl. imbricate on all sides. 

 Perianth 0. 



* Lowest glumes empty or smaller than the others. 



3. Gladidm. Spikelets 1 — 3-flowered. G].5or6. Bristles 0. 

 Nut with a thick fleshy coai, tipped with the conical base of 

 the style. 



4. Rhynchospoea. 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 glume empty or larger than the others, sometimes all 

 fertile. 



t Bristles scarcely equalling the glume or wanting. 



5. Elkochakis. One or 2 lowest gl. broader, empty. Bris- 



s2 



