lll. PoLYGONACEE. 345 
of P. Bistorta, Linn.; but the very thin, cordate-ovate, long and 
slenderly-stalked radical leaves and two or three cauline leaves, 
in which the conspicuous straight transverse veins of P, Bistorta 
are wanting, together with the exceedingly slender flower-spikes, 
make it easily distinguishable. More material, however, is 
required to draw up a complete description. 
40. Polygonum Persicaria, Linn. Sp. Pl. ed. 1, p. 301 ; Meisn. 
tn DC. Prodr. xiv. p. 117; Hook. f. Fl. Brit. Ind. v. p. 35; 
Franch. et Savat. Enum. Pl. Jap. i. p. 396; Franchet, Pl. David. 
p. 254. 
Cunt: Peking (David ex Franchet). 
Widely spread in Europe, Asia, and Africa, and colonized in 
America and Australasia. 
Possibly some of the specimens we have under P. nodosum, 
Pers., aud P. lapathifolium, Linn., may be referable to this. 
41. Polygonum pilosum, Mazim. (sub Keenigia) in Mél. Biol. 
xi. p. 808. 
KaNwsuH: western alpine regions on the Upper Hoangho and 
its aflluents (Przewalski ex Maximowiez). 
Sir Joseph Hooker (FI. Brit. Ind. v. p. 24) has already reduced 
Kenigia islandica, Lirn., to Polygonum ; and on this point 
Maximowicz says, speaking of his K. pilosa and K. fertilis, . . . . 
* Ochreæ folium juvenile involventes demum laceratodisrupte 
tam complete adsunt ac in Polygonis. Ita Kanigie nunc a 
Polygono differentia unica in radicula elongata ponenda, an 
sufficiens ? " 
42. Polygonum Pinetorum, Hemsl., n. sp. 
Herba perennis, glabrescens, erecta, 13~4 ped. alta, caulibus 
subsimplicibus sepius crassiusculis internodiis quam folia brevio- 
ribus. Folia breviter petiolata, membranacea, lanceolata, 4-7 
poll. longa, longissime aeuminata, basi cuneata vel interdum 
obscure obliqueque bilobata, integra, supra parcissime minuteque 
strigillosa, subtus presertim secus venas puberula ; ochreze 
ample, searioso-membranaces, brunneæ, eciliate, ut videtur 
truncate sed cito lacerate. Flores albi (A. Henry), circiter 
3-4 lineas diametro, pauci, laxe paniculati, glabri, omnes dis- 
tinete graciliterque pedicellati, bracteis minutissimis subtendi ; 
paniculis puberulis gracillimis axillaribus vel pseudoterminalibus 
quam folia sepius brevioribus; perianthii alte 5-fidi segmenta 
herbacea, paulum inzqualia, late obovato-spathulata ; stamina 8; 
