202 METASPERMAE OF THE MINNESOTA VALLEY. 



Baillon, Hist. PL IX, 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, 13; Russia, 2; S. 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. Pasc. I, 13 (1784). 

 A. macrophylla LAM. Enc. Meth. I, 252 (1783). 

 Siphisia glabra RAF. Med. Fl. I. 65 (1828). 

 S. sipho KLOTZSCH, Monatsber. 602 (1859). 



Wats, and Coulfc., Gray's Man. 6 ed. 445; Chap., Fl. S. St. 372; Upham, 

 Fl. Minn. 116; Engl. Solered. Nat. Pflanz. Ill, 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. PI 304 (1840); Benth. and Hook., Gen. PI. Ill, 89 

 (1880); Dammer in Engler and Prantl, Nat. Pflanz. 3, I a, 1 (1891). 



Genera: 30; 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. 300 (1737). 



Lapatlimu MOENCH, Meth. 355 (1794). 

 Acetosa NECK. Elem. II, 214 (1790). 



Benth. and Hook., Gen. PI. Ill, 100; Durand, 2nd. 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, 

 36; Russia, 32; Russian Europe, 20; S. Sts., 9; Rocky nits.*, 5; 

 California, 12-13; Canada, 8; E. Sts., 7; PI. King, 8?; PL 

 Wheel., 3; N. America, 17-20. 



Eumex verticillatus LINN. Spec. 334 (1753). 



Wats, and Coult., Gray's Man. 6 ed. 438; Upham, Fl. Minn. 120; Mac., 

 Fl. Can. I, 416; Chap., Fl. S. St. 385; Cov., Fl. Ark. 216; Trelease, Rev. 

 Rum. 85. 



