LariAnn Garner in this article said that P. plownamii lacked the marbled speckles though, but the petiole IS serrated.
http://davesgarden.com/guides/...
i increased the magnification on photo to see the leaf better. What do you think?
of course, the petiole wins, if it's clearly unique! so then we can move the pics to P.plowmanii.
But perhaps, somebody else can comment on this to confirm?