Frederick Welwitscii (1861). “Extract from a Letter, addressed to Sir William J. Hooker, on the Botany of Benguela, Mossamedes, &c, in Western Africa.”. The Proceedings of the Linnean Society. Botany. (London: the Linnean Society) V.: 182-187. May be downloaded from: https://ia600607.us.archive.org/33/items/mobot31753002653522/
archive.org
Hooker, Joseph Dalton. On Welwitschia, a new genus of Gnetaceae. Transactions of the Linnean Society v.24 (1864) pp 1-46. May be downloaded from https://archive.org/details/mobot31753002433701
