Named after the headstone nearest to the rose.

Here are details thanks to Laine!

23 December, 1861
On the 20th December, at Blakiston, nr. Mount Barker, South Australia, by
the Rev. W.B. Andrews, Incumbent, Mr. Octavius WELD, B.A., M.D., seventh
son of the Rev. J. Weld, M.A., Tenterden, Kent, England, to Miss. Ann
JOHNSTONE, fifth daughter of Mr. Henry Johnstone, J.P., of London, Canada
West.
He came to Australia via Canada