Locality
From Hollick (1930) (p. 79)
"Yukon River, north bank, 1 mile above Williams mine (original No. 38); collected by W. W. Atwood and H. M. Eakin in 1907 (lot 4641)."
Description
From Hollick (1930) (p. 79)
"Leaf small, about 4 centimeters in diameter, orbiculate, subpeltate, deeply cordate at the base, entire, at least below; nervation consisting of a midrib and three pairs of flexuous, dichotomously forked lateral primaries, all radiating from the point of attachment of the petiole, the pair next to the midrib strongest, the pair traversing the basal lobes weakest, thinning out, curving toward and disappearing close to the margin."
Remarks
From Hollick (1930) (p. 79)
"It is impossible to determine satisfactorily whether this leaf is peltate or whether the appearance of peltation is due to overlapping of the lobes at the head of the deep, narrow basal sinus. The margin is entire at the base - the only part preserved - and the general characters of the leaf, as far as they are preserved, indicate that it was orbiculate in outline, with camptodrome nervation.
The orbiculate type of leaf in the genus is well represented by Menispermites grandis Lesquereux (1883) (p. 80, pl. 15, figs. 1, 2) and the figures of this species show a broad, shallow curve or sinus in the basal margin that represents the equivalent of the narrow, deep sinus in our species."