POLYGONACER. 67 
FORM V.—Polygonum (aviculare) rurivagum. Jord. 
Prats MCCXXXI. 
P. rurivagum, Jord. Bor. Fl. du Centr. de la Fr. Vol. Il. p. 560. Norm. 1c. 
p. 141. 
Stem erect; branches spreading-ascending or erect at the apex. 
Leaves elliptical or strapshaped-elliptical, about as long as the inter- 
nodes, very acute. Ochre very long, brown at the base, shining 
silvery white and at length laciniate for the greater part of their length. 
Perianth strongly veined in fruit, green, with the margins of the 
perianth segments bright crimson, occasionally crimson all over. Nut 
a little longer than the perianth, reddish chestnut, slightly shining, 
especially on the angles. Plant greyish green. 
In corn-fields. Common in sandy and chalky districts in Kent, 
Surrey, Essex, and Norfolk. I have it also from Warwickshire and 
Durham. 
England. Annual. Late Summer, Autumn. 
A handsome plant, which I believe to be distinct as a subspecies, as it 
frequently grows intermixed with P. agrestinum, without intermediate 
forms. Stems 1 to 2 feet high, slender, with elongated internodes. 
The ochrex are much longer than in any of the preceding. Leaves 
1 to 2 inches long, much less spreading, and more attenuated at each 
extremity than in the forms previously described. Flowers generally 
2 or 3 together, } inch long, more or less tinged with very bright 
crimson. Nut with the point usually projecting beyond the perianth. 
Plant of a much less lively green than in the common forms, and 
with much the aspect of the continental species P. arenarium and 
P. Bellardi. 
FORM VI.—Polygonum (aviculare) littorale. Link. 
P. littorale, “ Link,” Meisn. in D.C. Prod. Vol. XIV. p. 98 (non Gren. & Godr.). 
Stem prostrate; branches prostrate or ascending at the apex. 
Leaves oblong-elliptical or oblong, shorter than the full-grown inter- 
nodes, subacute, rather thick, and somewhat fleshy. Ochree rather 
short, brown at the base, dull silvery white, and at length laciniate 
at the apex. Perianth rather strongly veined in fruit, green, with the 
margins of the perianth segments bright crimson, occasionally bright 
crimson all over. Nut a little longer than the perianth, chestnut, 
slightly shining, especially on the angles. Plant deep dull green. 
On sands, waste ground, and loose shingle by the sea. Probably 
K2 
