LIST OF HIGHER SEED-PRODUCING PLANTS. 179 



Living species: 30-35; temperate and warmer regions, 

 except Australia. Only 2 species in Europe. N. America, 6; 

 Canada, 4; California, 2; Tex.-Mex., 1; S. Sts., 3; E. Sts., 3. 



Fossil species: A large number in the Tertiary of 

 Europe, Saglialin, Greenland; Cretaceous in N. America. 



Myrica asplenifolia (Linn.) Baill. Hist. PL VI, 242 (1877). 



Liquidambar asplenifolium LiNN. Spec. 1418 (1753). 

 Comptonia asplenifolia Banks, Gaert. Fruct. II, 58 (1791). 

 Liquidambar peregrinum Reich, ex Steud. Noia. II, 54(1840). 

 Ifyrica comptonia C. DC. Prodr. XVI, 2, 151 (1864). 

 Wats, and Coult., Gray's Man. 6 ed. 470; Britt., Fl, N. J. 220; Upham, 

 Fl. Minn. 127; Mac, Fl. Can. 1,435; Chap., FI. S. St. 427; Engl., Nat. Pflanz. 

 Ill, 1, 28. 



North America: N. S., N. Br., Q., Ont. to Man. and 

 Saskatchewan; S. to N. Eng., N. J. and N. Car.; W. to Minn, 

 and Ind. 



Minn, valley: Reported from region S. of L. Minne- 

 tonka and along N. edge; rare or doubtful; dry wooded hills. 



XXIV. SALICACEAE Willow Family. 



Endlicher, Gen. PL 290 ( 1840); Benth. and Hook., Gen. PI. Ill, 411 (1880); 

 Pax, in Engler and Prantl, Nat. Pflanz. 3, I, 29 (1887). 



Genera: 2; N. temperate zone and a few in tropical 

 regions; according to Pax four distributional centers; (1) 

 Behring straits district; (2) central Europe; (3) Himalayas, 

 (4) Pacific N. America. 



Species: 178; 50-60 fossil, extending in the middle 

 Tertiary from N. polar to N. temperate regions. 



POPULITS Linn. Gen. 755 (1737). 

 Benth. and Hook., Gen. PL III, 412; Durand, Ind. Gen. Phan. 381; 

 Engler and Prantl, Nat Pflanz. 3, I, .35 (Pax); Schenck, Palaeophyt. 464. 



Living species: 18; Europe, Asia (Mid., Mount, and 

 N.); N. America and Mexico. N. America, 10-11; Russian 

 Europe, 9; Canada, 6-7; E. Sts., 5; California, 3-4; S. Sts., 4; 

 Rocky mts., 4; PI King, 4; PL Wheel., 4. 



Fossil species: Lower Cretaceous, Potomac region, 3 

 sp. {Fontaine) — Popidojihyllum; Upper Cretaceous, Greenla.nd 

 (Heer); N. America {Lesqiiereaux)\ Tertiary — Greenland. Sag- 

 halin, Spitzbergen, Alaska, California, Wyoming, Minn., 

 Europe. 30-40 described, but scarcely so many distinct. 



Populus monilifera Ait. Hort. Kew. Ill, 406 (1789). 

 P. angulata Ait. Hort. Kew. Ill, 407 (1789). 

 P. laevigata Ait. Hort. Kew. Ill, 406 (1789). 



