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Type: Article
Published: 2022-09-16
Page range: 239-247
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Notes on the nomenclature and taxonomy of Chiastophyllum and Umbilicus oppositifolius (≡Cotyledon oppositifolia, ≡Chiastophyllum oppositifolium) (Crassulaceae subfam. Sempervivoideae)

Ria Olivier Herbarium, Department of Botany, Nelson Mandela University, P.O. Box 77000, Gqeberha, 6031 South Africa
Australian National Herbarium, Centre for Australian National Biodiversity Research (a joint venture between Parks Australia and CSIRO), GPO Box 1700, Canberra ACT 2601, Australia.
classification Cotyledon oppositifolia Cotyledon sensu Linnaeus Telephium clade Umbilicus Umbilicus oppositifolius Eudicots

Abstract

We show that the genus name Chiastophyllum (Crassulaceae subfam. Sempervivoideae) was validly published in January 1930 by Otto Stapf. This is in contrast to some sources, which indicate the name was merely proposed by Stapf and validated later the same year by Alwin Berger. Stapf based Chiastophyllum on a sectional name published in Umbilicus in 1843 by Carl von Ledebour and, in doing so, published a new combination and a name at new rank. The place of publication and author attribution of Chiastophyllum oppositifolium, the name of the only species included in the genus, as well as of its basionym, Cotyledon oppositifolia, and of Umbilicus oppositifolius, are also clarified. At the rank of genus Chiastophyllum is at present usually treated as a synonym of Umbilicus.

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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Van Wyk, B-E. &amp; Smith, G.F. (2014) <em>Guide to the aloes of South Africa</em>. 3<sup>rd</sup> edn. Briza Publications, Pretoria, 376 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Walker, C.C. (2003) <em>Umbilicus</em>. <em>In</em>: Eggli, U. (ed.) <em>Illustrated handbook of succulent plants: Crassulaceae</em>. Springer Verlag, Berlin, pp. 364–367<em>; </em>whole work 458 pp. and XLVIII plates.</span></span></span></p>
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