It was one of 10 breeding lines to enter final stage evaluation trials in 1990 in Western Australia, New South Wales, Victoria, South Australia, and Queensland. Isoflavone analyses were provided by the University of Western Australia. The Western Australian Department of Agriculture will maintain breeders' seed. Morphological description York has a leaf mark consisting of a pale green, triangular crescent extending about two-thirds to the margin, flanked by narrow, white arms. The leaf mark is classified as C2A1 using the system in Collins et al.
Leaflets are moderately broad and have only a slight indentation.
They have a moderately weak tendency to produce a brown anthocyanin flush surrounding the crescent and along the midrib. This is particularly noticeable under cold and other growth-limiting conditions. Anthocyanin flecking is absent. Stipule pigmentation under closed canopies is moderate. Stems and peduncles are moderately hairy, while petioles have a few hairs and leaf upper surfaces are glabrous.