POLYGONUM 
1 17 
ii, 381 (1796) excl. var. 2 et var. 3; P. persicaria var. f 3 Wahlenberg FI. Upsal. 132 (1820) non L. ; P. lapathi- 
foliunt subsp. pallidum Fries FI. Suec. Mant. ii, 24 (1839)!; P. lapathifolium var. genainnm Grenier et Godron 
FI. France iii, 47 (1855); Syme Eng. Bot. viii, 76 (1868); P. lapathifolium subsp. lapathifolium verum Dyer and 
Trimen in fourn. Bot. ix, 36 (1871); P. lapathifolium race pallidum Rouy FI. France xii, 99 (1910). 
leones: — Curtis FI. Lond. i, 73, as P. pennsylvanicum ; Smith Eng. Bot. t. 1382; Reichenbach Iconogr. 
Crit. t. 495, fig. 688 as P. lapathifolium ; FI. Dan. t. 2412, as P. pallidum. 
Camb. Brit. FI. ii. Plate 124. (a) Flowering shoot. ( b ) Lower part of stem. ( c ) Lower leaf. 
(d) Portion of leaf, lower side (enlarged). (e) Persistent perianths (enlarged). (/) Achenes (enlarged). 
(g) Peduncle (enlarged). Huntingdonshire (E. W. H.). 
Annual. Stem erect, 3 — 9 dm., often becoming decumbent and then rooting near the base, much 
branched, glandular or subglandular, nodes rather swollen. Ochreae loose, not or only slightly 
ciliate. Petioles short. Laminae usually ovate to ovate-lanceolate, about 10 — 15 cm. long, attenuate 
at both ends, often with a dark blotch, more or less hairy and glandular. Peduncles strongly 
glandular. Spikes about 2^5 — 3 ’5 cm. long, stout. Perianth more or less glandular, greenish; early 
July to September. Stamens 6. Styles 2, free almost to the base, ultimately reflexed. Achenes 
bifacial, suborbicular, large (about 3 mm. long and 2^5 broad), scarcely longer than the persistent 
perianth, smooth, shining, nearly black. 
Moist, rich, waste places, and arable land ; common throughout the British Isles, but local 
or rare in hilly districts ; ascending to over 300 metres in Derbyshire. 
Iceland, Scandinavia, Denmark, Germany, France, central Europe (ascending to 1810 m.), 
Russia, southern Europe; Asia; America; Malaysia; South Africa, 
10. POLYGONUM NODOSUM. Plate 125 
Persicaria latifolia geniculata caulibus maculatis Rand in Ray Syn. ed. 3, 145 (1724); P. maculosa procumbens 
foliis subtus incanis Dillenius in Ray Syn. ed. 3, 146 (1724) [= forma salicifolium\ ; P. folio subtus incano Dillenius in 
Ray Syn. ed. 3, 145 (1724) [= forma salicifolium\ ; P. foliis salicis albae vulgaris Dillenius in Ray Syn. ed. 3, 145 
(1724) [= forma salicifolium\ 
Polygonum nodosum Persoon Syn. i, 440 (1805); Reichenbach Iconogr. Crit. v, 59 (1827); Borrer in 
Hooker Brit. FI. ed. 4, 165 (1838); Babington Man. ed. 5, 285 (1862); P. lapathifolium var. petecticale Stokes 
in Withering Bot. Arr. ed. 2, i, 412 (1787); P. lapathifolium var. macidatum Sibthorp FI. Oxon. 129 (1794); 
Persicaria maculata Gray Nat. Arr. ii, 270 (1821) inch P. salicifolia\ Polygonum lapathifolium var. nodosum 
Babington Man. 257 (1843); Grenier et Godron FI. France iii, 47 (1855); Syme Eng. Bot. viii, 76 (1868); P. 
lapathifolium subsp. macidatum Dyer and Trimen in fourn. Bot. ix, 36 (1871), including P. persicaria subsp. 
nodosum p. 37 partim ; P. maculatum Babington Man. ed. 7, 301 (1874); P. lapathifolium race nodosum Rouy 
FI. France xii, 99 (1910) including race turgidum. 
leones: — Curtis FI. Lond. i, 74, as P. pennsylvanicum var.; Babington in Eng. Bot. Suppl. t. 2822, as 
P. laxum\ Reichenbach Iconogr. Crit. t. 496, fig. 689; FI. Dan. t. 2648; Beck in Reichenbach Icon. t. 216. 
Camb. Brit. FI. ii. Plate 125. (a) Flowering shoot. ( b ) Lower part of stem, with leaves, (c) Portion 
of under side of leaf (enlarged). ( d ) Persistent perianth (enlarged). ( e ) Achene (enlarged). (/) Ochrea 
(enlarged), dissected and spread out. (g) Portion of peduncle (enlarged), (h) Petiole (enlarged). Huntingdon- 
shire (a and b) (E. W. H.). Cambridgeshire ( c — h) (A. H.). 
Exsiccata : — Billot, 1062, et 1062 bis, as P. lapathifolium ; Herb. FI. Ingric. iv, 540, as P. lapathifolium. 
Annual. Stem erect or decumbent, usually more or less spotted with red, especially near 
the nodes, more or less branched ; nodes more or less swollen. Ochreae shortly ciliate, truncate. 
Petioles short. Laminae very variable in size and shape, ovate to oblong, acute to acuminate, 
glandular beneath, sometimes with a dark blotch. Peduncle glandular. Spikes very variable in 
arrangement and size, cylindrical. Flowers early July to October. Perianth glandular, pink or pink 
and greenish. Achenes usually rather smaller and rather more acute than in P. lapathifolium , usually 
rather shorter than the persistent perianth. 
(/ 3 ) forma salicifolium comb. nov. ; P. persicaria var. £ Hudson FI. Angl. 148 (1762); P. persicaria 
var. 7 L. Sp. PI. ed. 2, 518 (1762); P. lapathifolium var. salicifolium Sibthorp FI. Oxon. 129 (1794); P. persicaria 
subsp. tomentosum Schrank FI. Baier. i, 669 (1789); P. incanum Willdenow Sp. PI. ii, 446 (1800); Persicaria 
salicifolia Gray Nat. Arr. ii, 270 (1821). 
leones : — Beck in Reichenbach Icon. t. 217, fig. 1 — 3, as P. tomentosum. 
Exsiccata: — Fries, iv, 73, as P. incanum ; Wirtgen, xi, 626, as P. pallidum ; Herb. FI. Ingric. viii, 540 b, 
as P. lapathifolium var. incanum. 
