The new species Drummondita billyacatting L.R.J.Shelton & K.R.Thiele is described for a taxon previously phrase-named as D. sp. Trayning (A.M. George 97), which is narrowly endemic to Billyacatting Hill in the Western Australian wheatbelt. The new species is morphologically readily separable from the widespread D. hassellii (F.Muell.) Paul G. Wilson and the morphologically rather similar D. longifolia (Paul G. Wilson) Paul G. Wilson. A key is provided to all species of Drummondita Harv. (Rutaceae).