_ 
70 ENGLISH BOTANY. 
ated at the base; segments with a prominent dorsal nerve. Stamens 8. 
Styles 3, very short, distinct. Nut about half as long again as the 
perianth, ovate-triquetrous, smooth, chestnut or pale chestnut. Plant 
not glandular. 
On sandy seashores. Very rare, and perhaps extinct in England. 
It used to grow at Muddiford, near Christchurch, Hants, where it 
was collected by Mr. Borrer as late as 1847, but it is said now to be 
extinct there. I have received, through the Botanical Society of 
Edinburgh, a specimen labelled from Bognor, Sussex, collected by 
Professor Balfour. In the Channel Islands it is much more plentiful, 
occurring at Grand Havre, in Guernsey, St. Ouen’s Bay, Jersey, and 
in Herm. 
England. Annual, Biennial, or Shrub. Summer, Autumn. 
Very like P. Raii, at least the herbaceous-stemmed forms are so, 
and these are the only ones I have seen from Britain or the Channel 
Islands, but the leaves are much thicker in texture, with revolute 
margins, and decidedly glaucous. The ochree are larger, those to- 
wards the apex of the branches as long as or longer than the inter- 
nodes, their base is more chestnut, and of thicker texture, the veins 
are much more numerous and some of them forked: the increased 
number of veins is doubtless produced by their forking close to the 
base, as in some ochrew there are only 6 veins, forked a little above 
the base, while in others there appear to be 12, which are distinct until 
they lose themselves in the stem. The perianth segments are broader 
and more obovate than in, P. Raii, but otherwise very similar. The 
nut is undistinguishable from that of P. Raii. 
Sea Knotgrass. 
French, Renouée maritime. 
Section IV.—PERSICARIA. Meisn. 
Stem branched (rarely nearly simple), erect or decumbent. Leaves 
lanceolate or elliptical, attenuated at both ends. Flowers in fascicles 
arranged in terminal spikelike racemes, which are often in pairs or 
disposed in panicles. Perianth scarcely enlarged in fruit. Stamens 
4 to 8. Styles 3 or 2. Embryo lateral; cotyledons narrow, folia- 
ceous, flat. 
SPECIES VIL—POLYGONUM HYDROPIPER. Lim. 
Prare MCCXXXIV. 
Billot, Fl. Gall. et Germ. Exsice. No. 72. 
- Annual. Stem geniculate at the base, and rooting at the lower nodes, 
then erect; rarely erect from the base, slightly swollen at the nodes, 
