84 POLYGONACER. 
Soutu Mexico, Chilapilla, Tabasco (Zinden)—Common in eastern Soura AMERICA 
and in the West Inpirs. Hb. Kew. 
8. Polygonum amphibium, Linn. Sp. Pl. p.517; DC. Prodr. xiv. p. 115 (varie- 
tates); A. Gr. Man. Bot. ed. 5, p. 416; Fl. Dan. t. 282. 
Mexico (Bourgeau).—A very widely dispersed species in the temperate and sub- 
tropical regions of the NorTHERN HemisPHERE. Hb. Kew. 
4. Polygonum aviculare, Linn. Sp. Pl. p. 519; DC. Prodr. xiv. p. 97 (varie- 
tates); A. Gr. Man. Bot. ed. 5, p. 417. 
Mexico (Bourgeau)—One of the commonest weeds of temperate and subtropical 
countries all over the world, supposed to have spread from Europe or Asia. Hb. Kew. 
5. Polygonum glabrum, Willd. Sp. Pl. ii. p. 447; DC. Prodr. xiv. p. 114; 
Griseb. Fl. Brit. W. Ind. p. 161; Wight’s Ic. Pl. Ind. Or. t. 1799. 
SoutH Mexico, region of Orizaba (Bourgeau, 1579; Sallé), Jalapa (Linden, 83), 
valley of Mexico (Bourgeau).— West InpiEs, southward to Uruguay ; also in the Paciric 
Isuanps, India, and Cuina. Hb. Kew. 
6. Polygonum hispidum, H. B. K. Nov. Gen. et Sp. ii. p. 178; DC. Prodr. 
xiv. p. 122. 
GUATEMALA, valley of Guatemala (Hartweg), Llano de San y uan de Dios (Ba noulli, 
139).—CoLomBia; Guiana; Braziu; Cusa. Hb. Kew. 
| 7. Polygonum hydropiperoides, Michx. Fl. Bor.-Am. i. p. 239; DC. Prodr. 
xiv. p. 103. et 6. vergatum, Meissn.; A. Gr. Man. Bot. ed. 5, p. 416. 
Polygonum virgatum, Ch. et Schl. in Linnea, iu. p. 45. 
Eastern CanabDa to FLoripaA.—MExico, valley of Cordova (Bourgeau, 2290), Vera 
Cruz to Orizaba (Miller, 1165).—Braziu; Cam. Hb. Kew. 
8. Polygonum lapathifolium, Linn. Sp. Pl. p. 517; DC. Prodr. xiv. p. 119; 
A. Gr. Man. Bot. ed. 5, p. 415. 
Eastern Canaba southward.—Mexico (Botteri, 811, 812; Bourgeau, 628; Coulter, 
1385 ; Berlandier, 2342); Guaremana (Bernoulli).—Also in Sourn America. This very 
widely dispersed weed of cultivation was probably introduced into America. Hb. Kew. 
9. Polygonum nodosum, Pers. Enchir. i. p. 440; DC. Prodr. xiv. p. 118. 
Mexico; GuateMaLa. Another very widely spread species, of which it is impossible 
to say where it is indigenous and where it is naturalized. Hb. Kew. 
10. Polygonum pennsylvanicum, Linn. Sp. Pl. p. 519; DC. Prodr. xiv. p. 120; 
A. Gr. Man. Bot. ed. 5, p. 388. 
Common in eastern Norru America—Mexico (Ehrenberg ex Meissner). 
11. Polygonum persicarioides, H. B. K. Nov. Gen. et Sp. ii. p. 179; DC. 
Prodr. xiv. p. 117. 
South Mzxico, Real del Monte to Zimapan (Coulter, 1384), region of Orizaba (Miller, 
1611; Botteri, 815, 816)—Conomsia to Guiana and Cutt. Hb. Kew. 
