Grevillea molyneuxii is a spreading to weakly erect shrub that typically grows to a height of 0.2–1 m (7.9 in – 3 ft 3.4 in).

Flowering occurs from August to November, and the fruit is an oval to elliptic follicle 12–14 mm (0.47–0.55 in) long.

[5] The specific epithet (molyneuxii) honours the horticulturalist William Mitchell Molyneux.

[6] Wingello grevillea grows in moist heath and shrubland in a few sites near Penrose in south-eastern New South Wales.

The main threats to the species include its small population size and distribution, inappropriate fire regimes and digging by animals such as pigs.