Travelled widely collecting plants in countries of Europe, the Middle East, southern Africa and Australia. Visited Port Jackson, New South Wales, for seven months from 1 June 1823 until December 1823 and assembled an exsiccatae of 645 local plants. A substantial number of Sieber's collections were acquired by MEL as part of the Steetz herbarium purchase. The most important collections of Sieber material are now in H, M, PR and W, but Stafleu & Cowan (1985) list 52 other herbaria containing some specimens.
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]