202 METASPERMAE OF THE MINNESOTA VALLEY. 
Baillon, Hist. Pl. 1X, 22; Benth, and Hook., Gen. Pi. III. 123; Durand, 
Ind. Gen. Phan. 345; Engler and Prantl, Nat. Pflanz, 3, I, 272 (Solereder): 
Schenck, Palaeophyt. 704-709. 
Living species: 180+ ; tropical and temperate regions. 
Europe, 18: Russia, 2; 8. Sts., 4; E. Sts., 3; Calif, 1. The 
section which is represented in Asia and N. America contains 
14 sps. 
Fossil species: 15-20; Cretaceous and Tertiary, Ne- 
braska (Heer); Greenland (Heer); Europe (Saporta); Aristo- 
lochiaephyllum in Lower Cretaceous, Potomac group (fon- 
taine) 1 sp. 
Aristolochia sipho L’Her. Stirp. Nov. Fasc. I, 18 (1784). 
A, macrophylla Lam. Enc. Meth. I, 252 (1783). 
Siphisia glabra Ra¥F. Med. FI. I. 65 (1828). 
S. sipho Kuorzscu, Monatsber. 602 (1859). 
Wats. and Coult., Gray’s Man. 6 ed. 445; Chap., Fl. 8. St. 372; Upham, 
Fl. Minn. 116; Engl. Solered. Nat. Pfianz. III, 1, 272. 
North America: Penn. to Minn. and Kan. 
Minn. valley: Reported from N. E. district and S. E. 
edge; rare or local; rich woods and moist river banks. 
XXXII. POLYGONACEAE. Buckwheat 
Family. 
Endlicher, Gen. Pl. 304 (1840); Benth. and Hook., Gen. Pl. III, 89 
(1880); Dammer in Engler and Prantl, Nat. Pflanz. 3, I a, 1 (1891). 
Genera: 380; cosmopolitan; arborescent forms princi- 
pally in tropical America; herbaceous in temperate regions; 
shrubby in E. Mediterranean and Inland-sea region of Asia, 
(Bentham and Hooker). Center of distr. N. temperate zone 
(Dammer ). 
Species: 650-700 living; 12-15 fossil. 
RUMEX Linn. Gen. 800 (1787). 
Lapathum Morncu, Meth. 355 (1794). 
Acetosa Neck. Elem. II, 214 (1790). 
Benth. and Hook., Gen. Pl. III, 100; Durand, Ind. Gen. Phan. 342; 
Engler and Prantl, Nat. Pflanz. 3, I a, 17 (Dammer). 
Living species: 150 described; 100+ reduced; cosmo- 
politan, but largely predominant in N. hemisphere. Europe, 
86; Russia, 82; Russian Europe, 20; 8. Sts., 9; Rocky mts., 5; 
California, 12-18; Canada, 8; E. Sts., 7; Pl. King, 8?; Pl. 
Wheel., 8; N. America, 17-20. 
Rumex verticillatus Linn. Spec. 384 (1753). 
Wats. and Coult., Gray’s Man. 6 ed. 438; Upham, Fl. Minn. 120; Mac., 
Fl. Can. I, 416; Chap., Fl. $8. St. 385; Cov., Fl. Ark. 216; Trelease, Rev. 
Rum. 85. 
