Locality
From Hollick (1930) (p. 96)
"Yukon River, south bank, about 1 1/2 miles below Seventymile Creek (original No. 80); collected by G. C. Martin in 1914 (lot 6815)."
Description
From Hollick (1930) (p. 96)
"Leaves broadly trilobate, rounded below to a peltate base; margin undulate or sparingly undulate-dentate; teeth blunt; nervation craspedodrome, tripalmate below, pinnate above; midrib straight; lateral primaries suprabasilar, opposite, diverging from the midrib at angles of about 45°, curving slightly upward for a short distance, then continuing almost straight, with about six branches on the under sides and two on the upper toward the extremities; secondary nerves arranged in three widely spaced, opposite or approximately opposite pairs with the habit of direction of the lateral primaries, the upper ones subtending more obtuse angles of divergence than the lower ones; basilar veinlets extending at right angles from the sides of the midrib and radiating downward from the base."
Remarks
From Hollick (1930) (p. 96)
"This species, which is the type of the genus, has the nervation and general aspect of a Platanus. It is lobed, at least on one side, but this does not necessarily imply that the same feature occurs to an equal extent on the opposite side, and as may be noted by careful examination of the figure, the leaf does not appear to be strictly equilateral. It apparently represents a unique type of leaf, of which it would be very interesting to obtain a perfect specimen."