"Yukon River, north bank, at Pickart's mine (original No. 26); collected by W. W. Atwood and H. M. Eakin in 1907 (lot 4638)."

"Leaf oblong-ovate, about 9.5 centimeters in length by 6.3 centimeters in width across the middle, broadly cordate at the base, rounded to the apex; margin minutely denticulate in its upper part, entire below; nervation pinnate, craspedodrome above, camptodrome below; midrib somewhat flexuous; secondary nerves strong, irregularly alternate, sharply ascending, the two longer ones respectively basilar and suprabasilar, simulatmg lateral primaries, branched on the outer sides; tertiary nervation almost straight at right angles to the secondaries, forming quadrangular areolae, irregularly disposed and connected at the base, forming a network of polygonal areolae."

"This well-defined, almost perfect leaf is apparently identical with those from the Patoot beds of Greenland referred to Sterculia variabilis Saporta (1868) by Heer (1883), despite the fact that this is a "Paleocene" species. Furthermore, comparison with Saporta's figures shows only a remote resemblance, sufficient to indicate generic but not specific identity. I have no hesitation, therefore, in referring the Alaskan specimen to a new species and, at least tentatively, in regardmg the Greenland specimens as specifically identical with it.