Mount Kupe and the Bakossi Mountains are now probably the stronghold for A. gabonensis.
In 1979 a single specimen of Ardisia koupensis was collected from the western slopes of Mount Kupe, just above Mbule.
The distribution and range of B. jaapii is extremely limited; confined entirely to the summit forests and scrublands of a singular mountain in Camaroon (Mount Kupe, a dormant volcano on the Western High Plateau), at elevations of approximately 1,800 meters.
The knowledge of the existence of B. kupense is learned only by a singular epiphyte on one small, cultivated mango tree (Mangifera indica), in a private garden in Nyasoso (at elev. 830 m), Mount Kupe.
It is native to Cameroon (Enyandong, Mt Kupe and the Bakossi Mountains), and Nigeria, where it is found growing habitually in submontane and montane, tropical or subtropical, moist forest, at elevations roughly between 800 and 2,050 meters.
In June 1996, however, it was for the first time found outside of Gabon, growing on the submontane slopes of Mt. Kupe, in Cameroon.
The Mount Kupe Bushshrike Telophorus kupeensis is known to be endangered due to its small range and declining quality of its habitat.
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Sites where B. bifarium specimens have been collected include: along the Douala to Bimbia road; Mfongu near Bagangu; Bana-Bateha near Fibé; Nkokom Massif near Ndom; Nyasoso on Mount Kupe; Kodmin in the Bakossi Mountains; and on Mount Cameroon.
In 1979 a single specimen of Ardisia koupensis was collected from the western slopes of Mount Kupe, just above Mbule.