Nepenthes × burkei H.J.Veitch, Gard. Chron. III, 1889(2): 492 1889.;
The island of Mindoro in the Philippines, where it grows at an elevation of 1100–2000 m as per Wikipedia;
Nepenthes × burkei Hort.Veitch ex Gard. Chron. ii. 492 et 493 fig. 69. 1889.
WIKI: Nepenthes burkei is a tropical pitcher plant native to the island of Mindoro in the Philippines, where it grows at an elevation of 1100–2000 m. It is very closely related to N. sibuyanensis and N. ventricosa. It has only recently entered cultivation.
The plant list says it as a hybrid but wiki says its native to Philippines.