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 asplenifolia (LINN.) Barty. Hist, Pl. VI, 242 (1877). 
Liquidambar asplenifolium Linn. Spec. 1418 (1753). 
Comptonia asplenifolia BANKS, Gaert. Fruct. II, 58 (1791). 
LTiquidambar peregrinum REicH. ex Steud. Nom. 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. 
IIT, 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; (8) 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 (1787). 
Benth. and Hook., Gen. Pl. ITI, 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; Pl! King, 4; Pl. 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 Air. Hort. Kew. IIT, 406 (1789). 
P. angulata AIT. Hort. Kew. III, 407 (1789). 
P. laevigata Ait. Hort. Kew. IIT, 406 (1789). 
