Locality
From Hollick (1930) (p. 108)
"Yukon River, north bank, at Pickart's mine (original No. 26); collected by W. W. Atwood and H. M. Eakin in 1907 (lot 4638)."
Description
From Hollick (1930) (p. 108)
"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 lower ones respectively basilar and suprabasilar, simulating 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."
Remarks
From Hollick (1930) (p. 108)
This well-defined, almost perfect leaf is apparently identical with those from the Patoot beds of Greenland referred to Sterculia variabilis Saporta (1868) (p. 400 [42], pl. 33 [12], figs. 6, 7) by Heer (1883) (p. 38, pl. 57, fig. 7) 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 regarding the Greenland specimens as specifically identical with it.
The species is named in honor of Mr. W. W. Atwood, by whom the specimen was collected."