Leader of the North Australian Exploring Expedition (1855-1857), which included Ferdinand Mueller. This expedition explored the Victoria River and Sturt Creek in the Northern Territory, before returning overland to Moreton Bay, Queensland. The collections from this expedition are in K and MEL. Gregory later led an expedition in search of Leichhardt (1857), along the Barcoo River (New South Wales) to Cooper Creek and Strzelecki Creek, arriving in Adelaide, South Australia, on 31 July 1858.
Extracted from: A.E.Orchard (1999) A History of Systematic Botany in Australia, in Flora of Australia Vol.1, 2nd ed., ABRS. [consult for source references]