13 
Allium oleraceum, L. From Plymouth ; collected by Mr. Briggs. 
Additional to the list of Devon species. 
JFolffia arrhiza, Wimm. (Lenina, Linn.). Mr. Syme sends a plen- 
tiful supply of this recent addition to our flora from Staines, Middle- 
sex. This pond and one at Walthamstow, Essex, are the only stations 
hitherto discovered in England for this little plant. 
Potarnogeton decipiens , Nolte. For the addition of this species to 
the British flora we are indebted to Mrs. Hopkins, of Bath, who has 
for several years recognized it as distinct, and now sends a supply of 
specimens (which unfortunately did not reach us before the parcels 
were sent out) from a canal in the neighbourhood of that city.* From 
these the following description is taken : — Stem long, terete, copiously 
branched. Leaves uniform, all submerged, membranous, bright grass- 
green, sessile, oblong, 2-3 inches long, 1-1 j inch broad, the edge not 
thickened or denticulate, the apex blunt with a slight rnucro, the base 
also rounded ; the midrib flattened with 3-6 fine longitudinal veins on 
each side of it, connected by fine regular transverse veinlets. Stipules 
f inch long, not winged on the back. Peduncle considerably 
thicker than the stem, under 2 inches long, about equal in thickness 
throughout. Spike more than 1 inch long when fully developed. 
Lamina of the sepals nearly round. The plant comes very near to 
P. lucens, but in that the leaves are not so much rounded at each end, 
slightly stalked, and the border is thickened and minutely denticulate ; 
the stipule is winged on the back on the lower part, and the peduncle 
is incrassated upwards. P.prcelongus has leaves with a similar border 
to those of P. decipiens , but they are different in shape, much more 
lengthened out and hooded at the apex, and the peduncle is more 
slender and three or four times as long. P. decipiens is admirably 
figured in Reichenbach’s ‘ leones,’ vol. vii. t. 35 ; and dried specimens 
have been issued in Reichenbach’s FI. Germ. Exsic. n. 1603, and the 
‘Herbarium Normale’ of Fries. We have seen specimens also from 
Upsala, gathered by Dr. Andersson, and from Geneva, gathered by 
Dr. Lagger. Descriptions will be found in Reich. Ic. FI. Germ., vol. 
* Since the above was printed we have received a letter from Mr. T. B. 
Flower, of Bath, who says, “This Potarnogeton was, I believe, first found by 
the late Mr. B. Withers and other botanists, who forwarded specimens to the 
London Botanical Society in 1848, when my attention w T as first directed to it.” 
He adds, “ I have noticed this plant for many seasons .... but could never 
obtain fruit.” 
