Thanks abread111 you are right, not enough leaflets. It doesn't key out to any of the major weedy Sennas and but does seem to key to either Senna clavigera or Senna barclayana. Both of these have bene recorded in our Region but not with about 150km of this location. The Pine Island area is a disjunct location of about a dozen plant or millipede species so this could be a relic rather than garden escapee population - but Luke only saw 1-3 plants- will check it out. Thanks