It inhabits coastal dry forests at an elevation of 70–270 m (230–890 ft).

P. aylmer-robinsonii reaches a height of 7–15 m (23–49 ft) and a trunk diameter of 20–30 cm (7.9–11.8 in).

Harold St. John discovered this species in 1949, and the specific epithet refers to Aylmer Francis Robinson, a member of the family that owned the island.

[3] P. aylmer-robinsonii has been reintroduced to the Makauwahi Cave Reserve on Kauaʻi, where the species is believed to have previously ranged.

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