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97. CYPEEACE^. 
Division III. GLUMIFERiE. 
(Orders XCVII. and XCVIII.) 
Leaves parallel-veined, persistent. Floral envelopes imbri- 
cate, bractlike. 
Order XCVII. CYPERACE^. , 
Fl. perfect or unisexual, each 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 row of bristles or abortive filaments. Anth. erect, 
entire at the apex. Ovary 1 -celled, 1 ovule at its base, often 
surrounded by bristles or enclosed in a bottle-shaped perianth. 
Style simple, trifid or bifid. Embryo enclosed within the base 
of the albumen. — h. with entire sheaths. 
Tribe I. CYPEREJ^.. Fl. perfect. Gl. 2-ranked. Perianth 0. 
1. Cyperus. 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. SCIRPEuE. Fl. perfect. Gl. imbricate on all sides. 
Perianth 0. 
* Lowest glumes empty or smaller than the others. 
3. Cladium. Spikelets 1— 3-flowered. Gl. 5 or 6. Bristles 0. 
Nut with a thick fleshy coat, 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 vjith the dilated base of the style. 
** Loivest glume emj>ty or larger than the others, sometimes all 
fertile. 
t Bristles scarcely equalling the glume or wanting. 
5. Heleochaeis. One or 2 lowest gl. broader, empty. Bris- 
tles 3— 6. Nut compressed, crowned with the persistent 
dilated base of the style. 
