Haworthia nigra (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Haworthia nigra" in German language version.

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1biodiversitylibrary.org

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archive.org

Adrian Hardy Haworth: Decas secunda novarum Plantarum Succulentarum. In: Philosophical Magazine. Band 64, 1824, S. 302 (online).

biodiversitylibrary.org

John Gilbert Baker: A Synopsis of Aloineae and Yuccoideae. In: Journal of the Linnean Society. Botany. Band 18, London 1881, S. 203 (online).