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 n-landulur. 



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 ochreaa 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 ochrece 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. Eaii, but otherwise very similar. The 

 nut is undistingui^hable from that of P. Raii. 



Sea Knotgrass. 



Frencli, Eenouee 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- 

 ccous, flat. 



SPECIES VII— POLYGONUM H YDROPIPE R. Linn. 



Plate MCCXXXIV. 

 Billot, Fl. Gall, et Germ. Exslcc. 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. 



