POLYGONUM 
1 1 1 
Throughout the British Isles, chiefly in arable land and waste places. 
(b) P. convolvulus var. subalatum Lejeune et Courtois Comp. FI. Belg. ii, 59 (1831); Rou y FI. France xii, 
93 (1910); P. convolvulus var. pseudo-dumetorum H. C. Watson in Lond. Cat. Brit. Plants ed. 6, 19 (1861) nomen; 
Syme Eng. Bot. viii, 61 (1868); P. convolvulus x dumetorum Giirke PI. Europ. ii, 124 (1897). 
leones: — FI. Dan. t. 756, as P. dumetorum. 
Camb. Brit. FI. ii. Plate 117. ( a ) Shoot with ripening fruits, (b) Flowers (one enlarged), (c) Persistent 
perianth (enlarged), enclosing ripe achene. Cambridgeshire (E. W. H.). 
Laminae about twice as long as broad. Inflorescence many-flowered. Exterior perianth- 
segments eventually narrowly winged. 
Though this variety is intermediate between P. dumetorum and P. convolvulus var. genuinum, there is, if we may judge 
by its distribution, no reason to regard it as a hybrid, though some authorities do so. It is not infrequently mistaken for 
P. dumetorum. 
Less widely distributed than var. genuinum , but common in the south and east of England ; partial to 
light soils, and occurring on sand-dunes ; from Cornwall and Kent to Shropshire and the West Riding of 
Yorkshire; Glamorganshire; Ireland; not recorded for Scotland. 
Finland, Denmark, Germany, Belgium, France, Switzerland, and doubtless elsewhere. 
Arable land, waste places, hedgerows, copses, and bushy places on sand-dunes ; generally 
distributed throughout the British Isles, as far north as Orkney ; local in western and northern 
Scotland, and in uncultivated, upland districts generally; ascending to 410m. on the Pennines, but 
only adventitious at the higher altitudes in its more northerly stations. 
Europe (excl. Arctic), ascending to 2300 m. in the Alps; northern Africa; Asia; naturalised in 
North America and in South Africa. 
3. POLYGONUM DUMETORUM. Plate 118 
Polygonum dumetorum L. Sp. PI. ed. 2, 522 (1762)!; Babington in Trans. Linn. Soc. xvii, 459 (1836); 
Syme Eng. Bot. viii, 62 (1868); Rouy FI. France xii, 94 (1910); P. scandens var. /3 L. Sp. PI. 365 (1753). 
leones: — Babington in Eng. Bot. Suppl. t. 2811 ; Beck in Reichenbach Icon. t. 223, fig. 1 — 4. 
Camb. Brit. FI. ii. Plate 118. (a) Shoot with ripening fruits. ( b ) Persistent perianths (enlarged), each 
enclosing a ripe achene. ( c ) Ripe achenes (enlarged). Surrey. 
Exsiccata : — Billot, 843; Fries, xiii, 67; Todaro, 670; Herb. FI. Ingric. vi, 546. 
Annual. Stem climbing, 8 or 9 dm. high, roundish in outline, striate, smooth. Petioles about 
half as long as the laminae. Laminae cordate- 
sagittate, acute to acuminate, smaller than in 
P. convolvulus , relatively broader than in P. 
convolvulus var. subalatum. Inflorescences lax- 
flowered, more floriferous than in P. convol- 
vulus ; partial inflorescences very numerous. 
Pedicels about as long as the fruits, capillary, 
jointed below the middle, reflexed in fruit. 
Flowers July and August. Outer perianth- 
segments becoming broadly winged in fruit, 
obovate, about 3 mm. long and 2 broad, 
decurrent on the pedicel. Achenes black, 
shining, sides concave. 
“ It was abundant near Chilworth, Surrey, festooning 
bushes in a wood, in 1910. In 1911, there was not a 
sign of a single plant ; yet the conditions appeared to be 
identical” (C. E. Salmon, in lilt.). 
Hedgebanks, bushy places, and woods ; 
local; Hampshire, Dorset, Devonshire, Somer- 
set, Sussex, Kent, Surrey, Essex, Hertford- 
shire, Wiltshire, Monmouthshire, Berkshire, 
Buckinghamshire. 
Southern Scandinavia, Denmark, Germany, France, central Europe (ascending to 1250 m. in 
Switzerland), Russia, southern Europe; Asia; North America (fide Gray’s New Man. 363 (1908)). 
