34 ENGLISH BOTANY. 
stipules are much narrower than in P. heterophyllus; the peduncles 
also are much longer and more slender and much less thickened 
towards the apex. 
The plant from the Boyne agrees perfectly with North American 
specimens of P. Lonchitis, Tuckerman, in the Herbarium of the late 
M. Gay, at Kew; but I suspect this is the same as P. salicifolius, Wolf- 
gang, of which I have not seen specimens. C. J. Hartmann describes 
a form of P. salicifolius with floating leaves, which Fries and Reichen- 
bach do not seem to have met with. 
Willow-leaved Pondweed. 
SPECIES VI—POTAMOGETON LANCEOLATUS. Sn. 
Pirate MCCCCY. 
P. nigrescens (?), Fries, Mant. iii. p.17, Summ. Veg. Scand. pp. 68 (67) and 214 
(ex descrip. non Herb. Norm.). 
Stem filiform, fragile, much branched, the lower branches barren. 
Leaves mostly alternate, submerged, sessile, scarcely at all amplexicaul, 
not recurved, rather short, strapshaped, rather abruptly attenuated at 
each end, flat, not undulated, not denticulate, translucent, with 3 or 
5 longitudinal ribs connected by few transverse veins, and with 
several rows of greatly elongated cancellate areolations along the mid- 
rib; upper leaves opposite, sometimes floating, but even then scarcely 
stalked, oblanceolate or oblanceolate-strapshaped, gradually attenuated — 
towards the base, subcoriaceous or translucent, of the same texture as_ 
the very short petiole, with 7 or 9 ribs, and numerous cross veins, which 
are conspicuous if the leaf be held against the light, when also small 
areolation is very distinctly perceptible all over the leaf, with larger 
areolations along each of the ribs: often the upper leaves are similar 
to the lower, except that they are broader, and more narrowed towards” 
the base. Stipules free from the petiole, small, narrow, acute, not 
winged on the back, scarious, with few fibres. Peduncles (alw rays?) 
axillary, rather short, not thickened towards the apex. Spike ovoid- 
oblong, very short. Sepals with their lamina rhombic-orbicular. Nutdl 
enbeitiern (?)—‘“ keeled with faint lateral ridges” (Lab.).* Plant dark 
green, often turning blackish in drying. 
In the river ics between Bodafon and Lligwy, Anglesea. Smith 
says it was sent him from lakes in North Wales by the Rey. H. Davies; 
probably from the station mentioned above. 
* I do not know whether the fruit described by Professor Babington is that of the 
Anglesea plant, which alone belongs to this species. 
