356 9t). CYPERACE.E. 



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

 bands, nuts striated. — E. B. 4fi7. -R- vii. 4.— Plant long. L. 

 broad. Ped. 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, Stvle short. — Near Roundstone, Cunnamara, 

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



Subdivision III. GLUMIFERiE. 



Leaves parallel-veined, persistent. Floral envelopes im- 

 bricated. 



Order XCVI. CYPERACE^. 



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 geuera see G. F. G. 

 Monncot. ii. 



Tribe I. CYPEREJE. Fl. perfect. Gl. 2-ranked. Perigone 0. 



1. Cyperus. Spikelets 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. SCIRPEJE. Fl. perfect. Gl. imbricated on all sides. 

 Perigone 0. 



* Lower glume empty or smaller. 



3. Cladium. Spikelets 1—2-flowered. Gl. 5or6. Bristles 0. 



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

 the jointless style. 



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

 Bristles about 6. Nut compressed, convex on both sides, 

 crowned with the diluted base of the jointed style. 



