Colonial Plants Database
The Colonial Plants Database is maintained by Historic Houses Trust at http://www.hht.net.au/research/colonial_plants.
Camden Park database
Hortus Camdenensis is an online database of over 3,200 plants and historical information, based on an illustrated catalogue of plants grown by Sir William Macarthur in the garden and nursery at Camden Park between c.1820 and 1861.
The Camden Park database is easily searchable and can be found at www.hortuscamden.com.