[1] Five additional specimens were studied from a location in the Eocene Okanagan Highlands, an outcrop of the Ypresian[2] Klondike Mountain Formation in Republic.

[4] The pollen flora has notable elements of birch and golden larch, and distinct trace amounts of fir, spruce, cypress, and palm.

However, further study has shown the lake system was surrounded by a warm temperate ecosystem that likely had a mesic upper microthermal to lower mesothermal climate, in which winter temperatures rarely dropped low enough for snow, and which were seasonably equitable.

[2][7] It was likely wind-dispersed seed, and possibly part of the canopy flora of the forests,[1] however the affinities of Pteronepelys with other flowering plants were unknown at the time of description.

[1] The genus name Pteronepelys is a combination of the Greek word elements Pteron meaning "wing" and epelys roughly translating to "stranger", while Manchester coined the specific epithet wehrii in honor of paleobotanist and artist Wesley Wehr, in recognition of contribution of the Klondike Mountain Formation specimens.