than the sessile achenes. Z. poIvcarDa Nolte 





4, JTajas Linn. Najas. 



%fi 



J 



void. Plants groiving in the sea. 



486 cv. NAiADACE^. IZannichaiia. 



3. Zaknichellia Linn. Horned Pond-weed. I StS 



Floivers mow^^dows. — Barren fl. Perianth none. Stam \ I ^^^| 



Anthers 2~4'Cel\ed. — Fertile Ji. Perianth smgle, of 1 leaf I ^^ 



Germens 4 or more. Style elongated, undivided. Stigma peltate' | 1. ^ 



Achenes nearly sessile. — Earned in honour of John Jerome i Ji^ 



Zannichelli, a Venetian apothecary and botanist. j | a 



1. Z. palustris L. {common H.) ; ^. 5. t. 1844. — «. flowers ti^^?^ 



sessile, style half as long as the shortly-stalked achenes.— /3. 1--3'"' 



flowers stalked, style half as long as the longest-stalked achenes! iW^^ 



Z. pedunculata Reich. — y. * style short, about six times shorter tn 



iore ; 



pitches and stagnant waters. ©. 8. — Floating. Stems \ow^, L liiie^ 



nate at the point. Flowers axillary, from a membranaceous hractea. \\\S 



filiform, branched. Leaves opposite, linear, entire, sometimes emaro-i. ., W 



Sterile f. upon a very short stalk, from the base of which arises a 



single naked anther, borne on a long white Jilainent, Anthers with 



2 — 4 cells. — The form of the stigma, the length of the style, the 



number of anther-cells,' the size and mode of growth, and the fruits 



more or less stipitate, are very variable ; and several proposed species I ^^'^V^! 



are described and figured by Reichenbach, some of which are noticed I CL^te 



above as varieties, ' ^^ 



on t)"6 ' 

 form s^'y 



mml'' 



Flotvers imperfect, destitute of perianth^ axillary, solitary. | 2. Z. 

 Barren fl. within a calyptriform spatha. Stam. 1. Anther J slort fe^ 

 nearly sessile, 4-celled. Fertile fl. without a spatha. Germen \ smooth, 

 1, sessile, with one erect ovule. Style 1. Stigmas 2 — 4, elon- 

 gated, linear. Fruit vfit\i 1 seed. — ]S"amed after the Naiades, I J^^^^^ 

 or Water-:N^ymphs. . " I ™^^ 



1 ofscrcs 



1. IsT. flexilis Ilostk, {flexible N,) ; leaves narrow linear 



very minutely denticulate, sheaths ciliato- denticulate. Cau- 

 linia flexilis Willd. 



Bottom of lakes and streams, near Roundstone, Connemara, Gal- I g^. 

 way. Mr, D. Oliver. 2JL. 8. — Leaves ternate or nearly opposite, 



] -nerved, pellucid, sharply but minutely and remotely denticulate. - r. 



We have not been able to examine the flowers of any of the genus j ^*^5 



in a recent state: the sterile plants have not, we believe, been found I M- 



in this country ; we observe four stigmas in the Irish specimens, as I ^hud 



described by Kunth, J ifj//^- 



( 



f 



5. ZosTERA Linn. Grass-wrack. i '^^n 



Flowers imperfect. Stamens and pistils inserted in 2 rows j ""■ 65^. 

 upon one side of a flat thin spadix. Spatha foliaceous. Anthers 



