knowlton.] TERTIARY PLANTS OF NORTH AMERICA. 1G7 
PISTACIA Linnaeus. Hort. Cliff, p. 456, 1737. 
Pistacia oblanceolata (Lx.) n. comb. 
Ficua oblanceolata Lx. Ann. Rept. U. S. Geol. and Georg. Surv. Terr., p. 
387, 1872 [1873] ; Tert. FL, p. 194, pi. xxviii, f. 9-12, 1878. 
Laramie group : Erie, Colorado ; Black Buttes, Wyoming. 
PISTIA Linnaeus. Gen., ed. i, p. 275, 1737. 
Pistia corrugata Lx. Ann. Kept. U. S. Geol and Geogr. Surv. Terr., 
p. 299, 1874 [1876]; Tert. Fl., p. 103, pi. lxi, f. 1, 3, 4, 6, 7, 9-11, 1878. 
Montana formation: Point of Rocks, Wyoming. 
Belly River series : Medicine Hat. 
PITYOXYTON Kraus. In Sckimper Pal. Veg., vol. ii, p. 377, 1870. 
Pity oxy Ion fallax Felix. Zeitschr. d. Deutsch. geol. Gesell. Jahr. 
1896, p. 254, 3896. 
Eocene: Yanceys, Yellowstone National Park. 
Pityoxylon Hollicki Kn. In Hollick, Trans. N. Y. Acad. Sci., vol. 
xvi, p. 134, figs, [in text] 1, 2, 1897. 
Clay marl (Upper Cretaceous) : Cliffwood, New Jersey. 
Pityoxylon inasquale Felix. Zeitschr. d. Deutsch. geol. Gesell. Jahrg. 
1886, p. 483, pi. xii, f. 3, 1886. 
Eocene?: Danaaku, Alaska. 
Pityoxylon Krausei Felix. Zeitschr. d. Deutsch. geol. Gesell. Jahrg. 
1886, p. 486, pi. xii, f. 1, 2, 1886. 
Fort Union group : Little Missouri, Dakota. 
Pityoxylon Pealei Kn. Bull. Torr. Bot. Club, vol. xxiii, p. 251, pi. 
cclxxi, 1896. 
Miocene: Upper Galletin Basin, Montana. 
Pityoxylon sp., Dn. Trans. Roy. Soc. Canada, vol. v, sec. iv, p. 33, 
1887. [Wood.] 
Belly River series: West of Medicine Hat. 
PLANERA Gmeliu. Syst., p. 150, 1791. 
Planera aquatica (Walt.) Gmel. Syst. Nat., vol. ii, p. 150, 1791; 
Hollick, Bull. Torr. Bot. Club, vol. xix, p. 332, 1892. 
Planera Gmelini Mx. Fl. Bor. Am., vol. ii, p. 248, 1803; Lx., Am. Journ. 
Sci., vol. xxvii, p. 365, 1859. 
Pleistocene: Banks of Mississippi River, near Columbus, Ken- 
tucky. 
Miocene?: Bridgeton, New Jersey. 
Planera crenata Newby. Proc. U. S. Nat. Mus., vol. v, p. 508, 1882 
[1883]. 
Tertiary : Tongue River, Wyoming. 
Planera dubia Lx. = Planera Ungeri. 
Planera Gmelini Mx. Lx.= Planera aquatica. 
Planera Knowltoniana Hollick in Newby. Fl. Amboy Clays, p. 69, 
pi. xlii, f. 1-4, 1895 [1896 J. 
Amboy clay : Woodbridge, New Jersey. 
