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, Saghalin, Greenland; Cretaceous in N. America. 



Myrica asplenifoiia (LINN.) BAILL. Hist, PL VI, 242 (1877). 

 Liquidambar asplenifolium LINN. Spec. 1418 (1753). 

 Comptonia asplenifoiia BANKS, Gaert. Fruct. II, 58 (1791). 

 Liquidambar peregrinum REICH, ex Steud. Nora. II, 54 (1840). 

 Myrica 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., Fl. 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. PL III, 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. 



POPULUS LINN. Gen. 755 (1737). 



Benth. and Hook., Gen. PL III, 412; Durand, Ind. Gen. Plian. 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; PI. Wheel., 4. 



Fossil species: Lower Cretaceous, Potomac region, 3 

 sp. (Fontaine) Populophyllum; Upper Cretaceous, Greenland 

 (Heer); N. America (Lesquereaux); 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). 



