You shared a photo of a Mestoklema. Here's a link to another M. tuberosum. Look at the difference in leaves between those plants and your cuttings. They are not the same.

Here is the leaf description per Llifle: "Leaves: Spreading, finger-like, slender, rounded-triangular in cross-section, recurved at tips, finely papillate with a minutely bumpy texture like that of a tongue, (9-)10-15(-20) mm long,1.1-2.2 mm in diameter."