Hi Betty, I've wondered about this taxon myself when out among the Dillwynias. It is in the PlantNET key to Dillwynia and comes out at couplet 22 leading to a brief description, even though at the top of the key it states it is not included - one of those annoying PlantNET things. Locally perhaps Mike Crisp might be the one to talk to about any likely formal description in the near future?
Betty there is a description at plant net herehttps://www.rbgsyd.nsw.gov.au/science/Scientific_publications/telopea/editorial_policy/editorial_policy2?sq_content_src=%2BdXJsPWh0dHAlM0ElMkYlMkZwbGFudG5ldC5yYmdzeWQubnN3Lmdvdi5hdSUyRmNnaS1iaW4lMkZOU1dmbC5wbCUzRnBhZ2UlM0Ruc3dmbCUyNmx2bCUzRHNwJTI2bmFtZSUzRERpbGx3eW5pYX5zcC4lMkJZZXRob2xtZSUyQiUyOFAuQy4lMkJKb2Jzb24lMkI1MDgwJTI5JmFsbD0x But I identify from other Dillwynia in the Act area because it has a straight leaf, stemless flowers (that are not in pairs) and because the tip of the leaves aren't pungent pointed