knowlton.] TERTIARY PLANTS OF NORTH AMERICA. 177 
Populus glandulifera Heer. Fl. Tert. Helv., vol. ii, p. 17, pi. lviii, f. 
5-11 j pi. lxviii, f. 7 1856; Oret. and Tert. FL, p. 226, pi. xlviA, f. 3, 
4, 1883. 
Eocene"?: Fort Graham, Alaska. 
Fort Union group: Montana; Bad Lands, Dakota. 
Miocene : John Day Valley, Oregon. 
Populus grandidentata Mx. Flor. Bor. Am., vol. ii, p. 243, 1803; 
Penhallow, Bull. Geol. Soc. Am., vol. i, p. 326, 1890. 
Pleistocene: Greens Creek, Ottawa River; Montreal, Canada. 
Populus Grewiopsis Ward. Bull. U. S. Geol. Surv., no. 37, p. 23, 
pi. ix, f. 1, 1887. 
Fort Union group: Seven-Mile Creek, Montana. 
Populus harkeriana Lx. Fl. Dak. Gr., p. 44, pi. xlvi, f. 4, 1892. 
Dakota group : Fort Harker, Kansas. 
Populus hederoides Ward. Bull. U. S. Geol. Surv., no. 37, p. 22, pi. 
viii, f. 5, 1887. 
Fort Union group: Seven-Mile Creek, Montana. 
Populus Heerii Sap. Ann. d. Sci. Nat., 4th ser., vol. xvii, p. 87, pi. 
vii, f.*3, 1863; Lx.. Cret. and Tert. Fl., p. 157, pi. xxx, f. 1-8; id. xxxi, 
f. 11, 1883. 
Green River group : Florissant, Colorado. 
Populus Heliadum Ung. Lx., 1873=Populus Ungeri. 
Populus Hookeri Heer. Fl. Foss. Arct., vol. i, p. 137, pi. xxi, f. 16, 
1868; Dn., Trans. Boy. Soc. Canada, vol. vii, sec. iv, p. 71. pi. x, f. 5, 
1889. 
Miocene?: Mackenzie River. 
Populus hyperborea Heer. Fl. Foss. Arct., vol. iii, pt. ii, p. 106, 1873 ; 
Lx., Fl. Dak. Gr., p. 43, pi. iii, f. 9-11; pi. viii, f. 1; pi. xlvii, f. 5. 1892. 
Dakota group : Kansas. 
Populus insequalis Ward. Bull. U. S. Geol. Surv., no. 37, p. 24, pi. ix, 
f. 2, 1887. 
Fort Union group : Burns's Ranch, Montana. 
Populus kansaseana Lx. Fl. Dak. Gr., p. 42, pi. xvii, f. 1-7, 1892. 
Dakota group: Kansas. 
Populus Knightii Kn. Bull. Geol. Soc. Am., vol. viii, p. 142, 1897. 
Laramie group?: Dutton Creek coal, Wyoming. 
Populus laevigata Lx. Am. Journ. Sci., vol. xlv, 2d ser., p. 205, 1868; 
Tert. Fl., p. 175, pi. xxii, f. 9, 1878. 
Populus ajqualis Scbimp. Pal. V6g., vol. ii, p. 693, 1872. 
Denver group?: Rock Creek, Laramie Plains, Wyoming. 
Populus Lancastrensis Lx. = Populites Lancastrensis. 
Populus latidentata Dn. Trans. Roy. Socf Canada, vol. iii, sec. iv, p. 
16, 1885 [1886J. 
Belly River series: Medicine Hat. 
Populus latior Al. Br. In Buckl. Geol., p. 512, 1835?; 'Heer., Fl. Foss. 
Alask., p. 25, pi. ii, f. 4, 1869. 
Eocene?: Port Graham. 
Bull. 152 12 
