This refers to the eyes of the potatoes being surrounded by yellow.
The skin is purple. Inside, the flesh is off-white.
The potatoes are only somewhat floury, so they can be boiled, but carefully.
Karupa-Rera Potatoes were developed in New Zealand.
Harris, Niha, “Nga – Riwai Ma-ori — Ma-ori Potatoes”, The Open Polytechnic of New Zealand, Working Paper, August 1999.