350 90. CYPERACE.E. 



2. Z. marina (L.) ; 1. linear 1 7-veined, spadix without 

 bands, nuts striated. E. B. 4f>7- R- vii. 4. Plant long. L. 

 broad. Fed. rather strong. Z. angustifolia is a slender form, 

 growing upon mud, which has fewer veins in its 1. and rather 

 longer peduncles. In the sea. P. ? VII. VIII. 



2. NAIAS Linn. 



1. N.flexilis (Rostk.) ; 1. very narrow and very minutely den- 

 ticulate, sheaths ciliate-denticulate. L. ternate or opposite, 1- 

 veined, pellucid, remotely denticulate. Ovary solitary, axillary, 

 sessile, oblong. Style short. Near Roundstone, Cunnamara, 

 Gahvay. Mr. D. Oliver, Jun. A. VIII. I. 



Subdivision III. GLUMIFE1LE. 



Leaves parallel-veined, persistent. Floral envelopes im- 

 bricated. 



Order XCVI. CYPERACE.E. 



Fl. perfect or unisexual, each with a scale or glume imbricated 

 on a common axis. Perigone 0, or rarely membranous. Stam. 

 hypogynous, definite, 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. 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. 

 Monocot. ii. 



Tribe I. CYPERE^E. Fl. perfect. Gl. 2-ranked. Perigone 0. 



1. CYPERUR. Spikdets 2-ranked. Gl. of 1 valve, many, 

 keeled, nearly all with flowers. 



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

 lower ones smaller, empty. Bristles few or 0. 



Tr. II. SCIRPE^E. Fl. perfect. Gl. imbricated on all sides. 

 Perigone 0. 



* Lower glume empty or smaller. 



3. CLADIUM. Spikelets 1 2-flowered. G1.5or6. Bristles 0. 

 Nut iv it h a thick fleshy coat, tipped with the conical base of 

 the jointless style. 



4. RHYNCHOSPORA. Spikelets few-flowered. Gl. 6 or 7. 

 Bristles about G. Nut compressed, convex on both sides, 

 crowned with the dilated base of t he jointed style. 



