270 OBSERVATIONS ON THE 
SPECIES NOT SUFFICIENTLY WELL KNOWN. 
III.—Z. potycarpa, Nolte, 1. c—Reich. Icon. Crit. t. 757, fig. 
1004. Stylis in fructu maturato ovariis feré sextuplo brevioribus ; 
etiam cl. Koch. ignota, species adhuc rarissima videtur. 
The plant represented by Miller (JU. Syst. Linn. t. 77) is re- 
garded by Smith as Z. palustris, W.; according to Miller, it is 
found in Europe and in Virginia. From his figure, it has four-celled 
conical anthers ; ovaries in number four, surrounded by a regular ur- 
ceolus (urcéole), with three short teeth; and, lastly, the fruit, by 
the shortness of the style, reminds us strongly of Z. polycarpa, N.: 
but on this point can we trust to the figure of Miller? We know, 
in other respects. so little of Z. polycarpa, that, if we should even 
have before us a plant resembling the figure of Miller, we should he- 
sitate to affirm that it was really the species of Nolte. It is evident 
that Smith had never seen any thing like it, since he says he had seen 
only one species in England; and if he had found more he would 
have distinguished them, instead of confounding in the same quota- 
tion different figures. Plukenet (Phytog. Lond. t. 102, fig. 7) has 
represented a Zannichellia which may be equally taken for polycarpa ; 
but it is impossible, even in less delicate characters, to decide after a 
figure published in 1691. 
1V.—Z. PERUVIANA.—Ab una ex Europeanis fortasse non di- 
versa. In aquis vivis lurini (Herb. Mus. Paris ). 
This plant exhibits nothing very positive in its fruit: the absence of 
the stamens prevents us from determining it with certainty. Perhaps 
it is a distinct species; perhaps only a mere variety of Z. repens. 
V.—Z. contorta.—Cham and Schlecht, Linn. 1827, p. 231. 
Potamogeton contortum, Desf: Atl. i, p. 150. In herbario flore 
atlanticee musi Parisiensis specimen fructibus parcis et immaturis 
nobis incertam facit speciem. 
We have little to say of the botanical geography of Zannichellia ; 
these plants appear scattered throughout the whole extent of the tem- 
perate regions of the two continents, extending very far towards the 
bi 
