The leaves are reduced to dark brown, narrow egg-shaped scales, 1.1–2.0 mm (0.043–0.079 in) long.

Flowering has been observed in August and January and the fruit is an oblong pod 43–47 mm (1.7–1.9 in) long.

[2][3] Bossiaea zarae was first formally described in 2015 by Russell Lindsay Barrett in the journal Nuytsia from specimens collected on Bigge Island in 2008.

[3] Princess May winged pea grows on sandstone ridges and pavements in low shrubland in the Prince Regent National Park and on Bigge Island in the northern Kimberley region of Western Australia.

[3] This bossiaea is listed as "Priority Three" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[2] meaning that it is poorly known and known from only a few locations but is not under imminent threat.