E.W. Searle collection of photographs, National Library of Australia, http://nla.gov.au/nla.pic-vn4654382.
David Phoenix of the Burke & Wills Web told me about two other images of the Burke and Wills tree at the National Library of Australia which had been misidentified as being at Royal Park. I have been in touch with the NLA to suggest they review the description of the two photos.
The photos are interesting because they show the gas lamp standards in Mt Alexander Rd. By April 1883 the gas lamps had got as far as Taylor st. The tree was further along Mt Alexander Rd, just past Albert St. The two images of the tree can be see at the Time Travellers website.