VASCULAR PLANTS OF NORTH DAKOTA 303 
348. Lapathum persicarioides (Linn.) Moench, Meth., 355 
(1794). 
Rumex persicariodes Linn. Sp. Pl. 335. (1753). 
Peninsula of Lake Ibsen, Butte. 
FAGOPY RUM Lobelius Obs. 513. (1576). Dodonaeus, Pempt. 
4:1: 32. (1583). Tour Els. p. 411. (1694). Gaertner (1791). 
349. Fagopyrum vulgare Hill. Br. Herb. 486. (1756). 
Fagopyrum esculentum Moench. Meth. p. 290. (1794). 
Leeds. 
350. Fagopyrum tataricum (Linn.) Gaertn. Fr. et. Sem. 
B2182, pl. 180, f. 6. (1791). 
Polygonum tataricum Linn. Sp. Pl. 364. (1753). 
Leeds, (extinct). 
RHEUM Linn. 
351. Rheum Rhaponticum Linn. Sp. Pl. 531. (1753). 
Ecsaped. Devils Lake. 
PERSICARIA J. de Manliis ex Brunfels Herb. Viv. Ic. II: 
173. (1531). Tour. Els. Bot. 410. (1694). 
Section POTAMOCALLIS Nwd. A. Midl. Nat. II: 216. (1912) 
352. Persicaria rigidula (Sheldon) Greene in Leaflets, Vol. I, 
p. 24 and 29. (1904). 
Presenting four phases: (a) aquatic, extremely rare; (b) 
semi-aquatic; (c) riparian; and (d) terrestrial, which is sterile. 
Leeds, Butte. 
353. Persicaria ammophila Greene, |. c., p. 471, and Am. 
Midl. Nat. Vol. II., p. 236. (1912). 
Fargo (Cl. Waldron). 
354. Persicaria sp. (terrestrial phase), Thorne (Rolette Co.). 
355. Persicaria Hartwrightii (A. Gray) Greene in Leaflets 
l. c. p. 24. (1904), and in Am. Mid. Nat. II. p. 15. (1911). Ripar- 
ian phase. Pleasant Lake 
Section EUPERSICARIA. 
356. Persicaria lapathifolia (Linn.) S. F. Gray, Nat. 
Arr. II, p. 270. (1821). 
Polygonum lapathifolium Linn. Sp. Pl. 360. (1753). 
Leeds. 
357. Persicaria lapathifolia nodosa (Pers.) Lunell. 
Polygonum lapathifolium nodosum (Pers.) Small, Mem. Torr. 
Bot. Club 5: 140. (1894). 
Polygonum nodosum Pers. Syn. I: 440. (1805). 
