Localities. — Tn ditches and ponds. Frequent.— O.rfordsh. Between Ilead- 
ington and the Wick: I)r. Sibthorp. In the stream of water that divides 
Cowley Marsh from Bullington Green ; W. B. — Cambridgesh. At Hinton, &c.: 
Rev. R. Rii.han. — Devon; In the Mill Pond at Lympstotie. — Durham; In 
ditches near Gateshead; in ponds near Hilton Castle, at Hebburn Quay; and 
Monkwearmouth : N. J • Winch, Esq.- Kent ; In ponds upon the green Sand : 
Rev. G. E. Smith. — Lancash. Between Formby landmark and the sea, ten 
miles N. of Liverpool : Dr. Rostock. In Tranmore pool, in the Mersey, op- 
posite to Liverpool: Mr. Shepherd. Ditches in Birkdale, near Southport: 
G. Crosfield, Esq. — Northumberland ; In ditches near St. Peter’s Quay, and 
in ponds at St. Anthon’s: Walker and Benwell. Ditches at the mouth of 
the Whiteadder. Pond at Scremmerston Lime-kilns ; and in ditches near 
Windmill-hill: Dr. G. Johnston. — Somersetsh. In the Canal, between 
Sydeny Gardens and Bathampton : Mr. E. Simms. — Suffolk; Ditches near 
Bungay: Mr. Woodward. — Warwicksh. Near Kinwarton, and Oversley ; 
and in the neighbourhood of Alcester: Mr. Purton. In a pond in a field at 
the end of the first lane on the right hand side of the Hillmorton upper street- 
road, going from Rugby, near Mr. Cleaver’s Garden, 1831 : W. B. — Worces- 
tersh. On Feckenham Moors: Mr. Pcrton. — W r ALES. In the Isle of Angle- 
sey: Rev. H. Davies. — Flintsh. Ditches adjoining Rhyd Marsh near Pres- 
tatyn: Mr. Griffith. — SCOTLAND. Loehend : Mr. Null. In a small 
pool near LufFness: Dr. Greville. — IRELAND. Ditches at Sandymount, 
&c. : Mr. J. T. Mack ay. 
Annual. — Flowers from June to September. 
Root of several very slender fibres. Stems long, thread-shaped, 
smooth, very much branched, leafy, floating. Leaves numerous, 
opposite, frequently somewhat whorled, growing 3 or 4 together 
from the same joint of the stem, very narrow, strap-shaped, acute, 
entire, beautifully reticulated. Bracteas axillary, tubular, mem- 
branaceous, including one barren flower , consisting of a simple 
stamen ; and one fertile flower on a short stalk. Anther oblong, 
with 4 furrows and 4 cells (see figs. 1 & 2.) on a long white fila- 
ment (fig. 1.). Germcns about 4 or 5, almost sessile, oblong, 
somewhat compressed. Styles short, with very broad, peltate, 
spreading stigmas, which are either quite entire, or slightly in- 
dented at the margin. Capsules oblong, compressed, their outer 
edge tuberculated or toothed, the teeth sometimes becoming long, 
and resembling short transparent spines. 
The whole plant is smooth, and has the habit of a Polamogeton. 
It is a native of most parts of Europe, and Virginia ; and it is said 
to grow in the Thermal Mineral Waters of Albano, where the 
temperature of the water is at 95°. of Fahr. 
Zannichellia dentata of Willdenow, which is distinguished from the above 
species by its 2-celled anther, and toothed stigma, is admitted as a British 
plant by Mr. Gray, but on what authority he does not mention. It was first 
separated from Z. palustris by Professor Willdenow, at the suggestion of 
Sir J. E. Smith, who observes, that it was long ago well distinguished by Mi- 
cheli, in his Nova Plantarum Genera, t. 34. f. 2. and that if he be correct 
as to the 2 cells of its anther, and the toothed stigmas, nothing can be more 
distinct. It may, says Sir James, probably be found in England. 
The Rev. J. Jacob, LL. D. author of a very excellent, and extremely in- 
teresting and instructive “ Flora of West Devon and Cornwall,” now publish- 
ing in monthly numbers, has very recently sent me a dried specimen of a 
Zannichellia, which a friend of his, who discovered it, is inclined to think is 
Zannichellia dentata ; hut the specimen is not in a sufficiently perfect state to 
enable me to determine with certainty to which species it belongs. Z. palustris, 
in the neighbourhood of Oxford, has the stigmas frequently somewhat in- 
dented. 
