Locality
From Hollick (1930) (p. 76-77)
"Yukon River, north bank, at Williams coal mine (original No. 2AC284); collected by A. J. Collier and Sidney Paige in 1902 (lot 2985)."
Description
From Hollick (1930) (p. 76-77)
"Leaf reniform, about 6 centimeters in length by 9.5 centimeters in maximum width, rounded from the middle in both directions, lower part curving to a short, abruptly wedge-shaped base; nervation flabelliform, consisting of a midrib and six lateral primaries, all of approximately equal rank and all radiating from a common base, the laterals forked or branched from the under sides, the branches forked in a similar manner and terminating in the margin."
Remarks
From Hollick (1930) (p. 76-77)
"This specimen is evidently imperfect, as far as the margin is concerned, in all except the basal portion and it is impossible to determine whether it was entire or dentate in its upper part. The thickness of the midrib where it is broken away indicates that the apex of the leaf was probably somewhat extended beyond this point and that the outline of the perfect leaf was similar to that of Castaliites cordatus, the species last described.
Heer (1870) (p. 64, pl. 14, figs. 1, 2) describes and figures, under the name Nymphaea arctica, some fragmentary leaf remains from the Tertiary of Svalbard which are suggestive of our specimen and may possibly belong in the same genus; but the base, unfortunately, is missing, and without that part any satisfactory comparison is impossible."