356 
95. NAIADACE^. 
3. Zannichel'lia Linn. Homed Pondweed. 
1. Z. pahis'tris (L.); stj-le at least half as long as the fruit. — 
E. B. 1^4. R. vii. 16. — Floating. L. slender, opposite, filifonn. 
Fl. axUlary, sessile, /intli. 2 — 4-ceUed. Style \ as long as fruit. 
Stigmas generally notched at the margin. — ^. Z. pedicellata 
(Fr.) ; style as long as the fruit. Clusters usually stalked. Pe- 
dicels long. — [Z. polycar'pn (Nolte), style scarcely a sLxth of the 
length of the nut, has not been foimd in Britain.] — Stagnant 
water. j3. Brackish water. A. or P. V.— VIII. E. S. I. 
Order XCV. NAIAD ACE^. 
Fl. moncBcious or dioecious, in a spath. Perianth 0. Stam. 
free, 1 — 3. Ovary 1, superior, with 1 ovule. Style 1 ; stigmas 
2 — 4, fUifonn. Fr. a nut inclosed in the persistent spath, 
1-celled, 1-seeded, not bursting. Albumen 0. Embryo with a 
thin skin having a lateral cleft. 
1. ZosTEBA. Fl. imperfect. Stam. and pistils inserted in 
two rows upon one side of a spadix. Spath linear, leaflike. 
Fl. naked. Anth. 1. Ovaiy 1 ; style 1 ; stigmas 2. 
2. Naias. Fl. imperfect, solitary, sheathed: no perianth. 
Barren fl. of 1 stamen. Feitile : style short ; stigmas 2 — 4, 
filifonn. 
1. Zoste'ea Linn. Grass-wrack. 
1. Z. nana (Roth) ; 1. linear 1-veined, ped. filiform, spadix 
short with 2—5 clasping, bands, nuts smooth. — E.B. S. 2931. 
R. vii. 2. — Plant small, scarcely 3 in. long. L. slender. Ped. 
pale-colom-ed throughout, ^ as broad and quite as long as the 
inflated oblong-lanceolate spaths. — Muddy estuaries. P. ? VII. 
vm. E. S. 
2. Z. marma (L.) ; 1. linear 1 — 7-veined, spadix without 
bands, nuts striate. — E. B. 467. R. vii. 4. — Plant long. L. 
broad. Ped. rather strong. — Z. angiistifSlia is a slender form, 
growing upon mud, which has fewer veins in its 1. and rather 
longer peduncles which are much compressed and green upwai'ds 
and narrow gradually into the spadix. — In the sea. P. ? VII. 
VIII. E. S. I. 
2. Na'ias Linn. 
1. N. Jlex'ilis (Rostk.); 1. very narrow and very minutely 
denticulate, sheaths ciliate-denticulate. — L. temate or opposite, 
1-veined, pellucid, remotely denticulate. Ovary solitary, axil- 
lary, se-ssUe, oblong. Style short. — Near Roundstone, Conne- 
mara, Galway. Prof. Oliver. A. VIII. I. 
