95. NAIADACEH.—-96. CYPERACEA. 345 
elongated.—[Z. polycarpa (Nolte), style scarcely a sixth of the 
length of the nut, has not been found in Britain.]—Stagnant 
ey 8. Brackish water. A. or P. V.—VIII. Horned Pond- 
weed, 
Order XCV. NAJADACEZE. 
Fl. moneecious or dicecious, in a spath. Perianth 0. Stam. 
free, 1—3. Ovary 1, superior with 1 ovule. Stigma 1, sessile ; 
or 2 or 3, filiform. Fr. a nut inclosed in the persistent spath, 
i-celled, 1-seeded, not bursting. Albumen 0. Embryo with a 
thin skin having a lateral cleft. 
1. Zostera. FI). imperfect. Stam. and pistils inserted in 
two rows upon one side of a spadix. Spath linear, leaflike. 
Fl. naked. Anth. 1. Ovary 1; style 1; stigmas 2. 
2. Natas. FI. imperfect, solitary, sheathed, no perianth. 
Barren fl. of | stamen. Fertile: style short; stigmas 2 or 3, 
filiform. 
1. Zostera Linn. 
1. Z. nana (Roth); 1. linear 1-nerved, ped. filiform, nuts 
smooth.—E. B. S. 2931. R. vii. 2.—Plant small, scarcely 3 m. 
long. L. slender. Ped. quite as long as the inflated oblong- 
lanceolate spaths.—Mnuddy estuaries of the south coast of En- 
gland. P.? VII. VIII. E 
2. Z. marina (L.); 1. linear 1—7-nerved, nuts striated. —E. B, 
467. R. vii.4.—Plant long. L. broad. Ped. rather strong.— 
Z. angustifolia is a slender form, growing on mud, which has 
fewer nerves in its 1. and rather longer peduncles.—In the sea. 
P.2 VII. VIII. 
2. Natas Linn. 
1. N. flewilis (Rostk.); 1. very narrow and very minutely den- 
ticulate, sheaths ciliate-denticulate—L. ternate or opposite, 1- 
nerved, pellucid, remotely denticulate. Ovary solitary, axillary, 
sessile, oblong. Style short—Near Roundstone, Cunnamara, 
Galway. Mr. D. Oliver, Jun. A. VUI. 
Subdivision III. GLUMIFERA. 
Leaves parallel-veined, persistent. Floral envelopes imbri- 
cated. 
Order XCVI. CYPERACEZ. 
FI. perfect or unisexual, each with a scale or glume imbricated 
on a common axis. Perigone 0, or rarely membranous. Stam. 
ab 
