Skip to main content Skip to main navigation menu Skip to site footer
Type: Article
Published: 2022-09-16
Page range: 239-247
Abstract views: 38
PDF downloaded: 1

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.

References

<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Adanson, M. (1763 [July–August]) <em>Familles des plantes. Contenant une Préface Historike fur l’état ancien &amp; actuel de la Botanike, &amp; une Téorie de cette Science</em>. II. Partie. Chez Vincent, Imprimeur-Libraire de M<sup>gr</sup> le Comte de Provence, rue S, Severin, Paris, 640 pp. [https://www.biodiversitylibrary.org/item/6958#page/794/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Anonymous. (1837a [6 May]) Nordmann’s scientific tour on the east coast of the Black Sea. <em>The Athenæum</em> [<em>Journal of Literature, Science, and The Fine Arts</em>] No. 497: 326–327. [https://books.google.com.au/books?id=-T7wigIOhhUC&amp;lpg=PA326&amp;ots=v4VtJtbSH3&amp;pg=PA326#v=onepage&amp;q&amp;f=false]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Anonymous. (1837b) Voyage scientifique. 1. Expédition de M. le Professeur Nordmann sur la côte orientale de la mer Noire. (Extrait de deux lettres adressées à MM. Baer et Fuss et lues le 24 février 1837.) <em>Bulletin Scientifique (publié par l’) Académie Imperiale des Sciences de Saint-Pétersbourg [St. Petersburg &amp; Leipzig]</em> II(6): 91–95. [https://www.biodiversitylibrary.org/item/43693#page/276/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Baker, J.G. (1881 [21 February]) Notes on a collection of flowering plants made by L. Kitching, Esq., in Madagascar in 1879 (Plates VII. &amp; VIII.). <em>Journal of the Linnean Society, Botany</em> 18: 264–281. [https://www.biodiversitylibrary.org/item/8373#page/271/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Baillon, M.H. (1885 [séance du 18 février]) Liste des plantes de Madagascar (suite de la page 464). [<em>Kalanchoe</em> § <em>Kitchingia</em>]. <em>Bulletin Mensuel de la Société Linnéenne de Paris (Paris)</em> 1 (59): 465–472. [https://www.biodiversitylibrary.org/item/41447#page/60/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Berger, A. (1930 [Mai]) Crassulaceae. <em>In</em>: Engler, A. &amp; Prantl, K. (eds.) <em>Die natürlichen Pflanzenfamilien</em>. edn 2, Vol. 18a. Verlag von Wilhelm Engelmann, Leipzig, pp. 418–419, 465.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Boissier, [P.]E. (1872) <em>Flora orientalis: sive, enumeratio plantarum in oriente a graecia et aegypto ad indiae fines hucusque observatarum. Volumen secundum. Calycifloræ. Polypetalæ</em>. Apud H. Georg, Bibliopolam, Genevæ [Genève] &amp; Basileæ [Basel] &amp; Apud Eumdem, 65, rue de Lyon, Lugduni [Lyon], 1159 pp. https://www.biodiversitylibrary.org/page/18113227#page/7/mode/1up [title page]; and https://www.biodiversitylibrary.org/page/18113227#page/783/mode/1up [<em>Pseudosedum</em> on p. 775]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Candolle, A.P. de. (1801) Histoire naturelle. Botanique. Extrait d’un mémoire sur la famille des Joubarbes. <em>Bulletin des Sciences, par la Société Philomathique (de Paris)</em> 3 (49): 1–2. [https://www.biodiversitylibrary.org/page/5495103#page/9/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Dalla Torre, C.G. de &amp; Harms, H. (1900–1907) <em>Genera siphonogamarum ad systema englerianum conscripta</em>. Sumtibus Guilelmi Engelmann, Lipsiae, 921 [922] pp. https://doi.org/10.5962/bhl.title.26684</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Dandy, J.E. (1948) <em>Umbilicus</em> DC. <em>In</em>: Riddelsdell, H.J., Hedly, G.W. &amp; Price, W.R. (eds.)<em> Flora of Gloucestershire; phanerogams, vascular cryptogams, charophyta</em>. Published on behalf of the Cotteswold Naturalists’ Field Club, Cheltenham, 667 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;">Eggli, U. (2003) List of abbreviations and symbols. <em>In</em>: Eggli, U. (ed.) <em>Illustrated handbook of succulent plants: Crassulaceae</em>. Springer Verlag, Berlin, pp. IX–X<em>; </em>whole work 458 pp. and XLVIII plates.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Eggli, U., ’t Hart, H. &amp; Nyffeler, R. (1995) Chapter 11. Toward a consensus classification of the Crassulaceae. <em>In</em>: ’t Hart, H. &amp; Eggli, U. (eds.) <em>Evolution and systematics of the Crassulaceae</em>. Backhuys Publishers, Leiden, pp. 171–192; whole work 192 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;">Farr, E.R. &amp; Zijlstra, G. (eds.) (1996+) <em>Index nominum genericorum (plantarum)</em>. Available from: http://botany.si.edu/ing/ (Accessed 30 April 2022).</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Fischer, F.[E.L. von, Fedor Bogdanovic] (1809) 22. Notice. Sur une plante de la famille des succulentes (Joubarbes, Sempervivae). <em>Mémoires de la Société Impériale des Naturalistes de Moscou [Moscow]</em> II: 269–274. [https://www.biodiversitylibrary.org/page/54238327#page/317/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hamet, R. (1910 [Janvier]) Sur quelques <em>Kalanchoe</em> peu connus (Suite). <em>Bulletin de la Société Botanique de France</em> 57: 49–54 [“Quatrième serie—Tome X”]. [https://www.biodiversitylibrary.org/item/8679#page/87/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">IPNI. (2022+) <em>The International Plant Names Index</em>. Available from: https://www.ipni.org/ (continuously updated; accessed April 2022).</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Koorders, S.H. (1919 [Mai] [24 October 1918]) Beitrag zur Kenntniss der Flora von Java No. 18. Beschreibung von <em>Kalanchoë Schumacheri</em> vom Idjen-Plateau und Revision der Crassulaceae von Java. (Mit 2 lithographischen Tafeln.). <em>Bulletin du Jardin Botanique de Buitenzorg</em> sér. 3, 1 (3): 169–180, Figures 14 and 15. [https://www.biodiversitylibrary.org/item/27173#page/205/mode/1up (text); https://www.biodiversitylibrary.org/item/27173#page/243/mode/1up (figures)]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ledebour, C.F. von. (1830 [July–December?]) <em>Flora Altaica</em>. Tomus II. Classis VI. [Hexandria Monogynia]–Classis XIV. [Didynamia]. [“225. Cotyledon <em>Linn</em>.” treated on pp. 197–200]. Typus et impensis G. Reimeri, Berolini [Berlin], 464 pp. [https://babel.hathitrust.org/cgi/pt?id=mdp.39015026703242&amp;view=1up&amp;seq=221&amp;skin=2021]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ledebour, C.F. von. (1843) <em>Flora rossica sive enumeratio plantarum in totius imperii rossici provinciis europaeis, asiaticis, et americanis hucusque observatarum</em>. Voluminis II. Pars I. [<em>Umbilicus</em> sect. <em>Chiastophyllum</em> on p. 176]. Sumtibus Librariae E. Schweizerbart, Stuttgartiae [Stuttgart], 937 pp. [https://www.biodiversitylibrary.org/page/6104596#page/202/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Linnaeus, C. (1753) <em>Species plantarum, exhibentes plantas rite cognitas, ad generarelatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas</em>. Vol. 1. Salvius, Stockholm, 560 pp. http://doi.org/10.5962/bhl.title.669</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Messerschmid, T.F.E., Klein, J.T., Kadereit, G. &amp; Kadereit, J.W. (2020) Linnaeus’s folly—phylogeny, evolution and classification of <em>Sedum</em> (Crassulaceae) and Crassulaceae subfamily Sempervivoideae. <em>Taxon</em> 69 (5): 892–926. https://doi.org/10.1002/tax.12316</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Metzing, D. (2017) The scientific heritage of the gardener, botanist, and succulent researcher Alwin Berger. [<em>In</em>: M. Mariotti &amp; L. Minuto (eds.) Alwin Berger and others. The signs of German culture in the gardens and in the Riviera landscape before and after the Great War. Proceedings of a conference held on 28 October 2016 organised by Università degli Studi di Genova, Centro Servizi di Ateneo per i Giardini Botanici Hanbury, with the support of the Alwin Berger Archiv, Möschlitz, Germany. Giardini Botanici Hanbury, La Mortola, Ventimiglia, Italy.] <em>Bollettino dei Musei e degli Istituti Biologici dell’Università di Genova</em> 79: 17–44.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nordmann, A.[D.] von. (1837 [lu le [read] 30 juin 1837]) NOTES. 23. Vorläufige Diagnosen einiger während einer naturwissenschaftlichen Reise im westlichen Theile der Kaukasischen Provinzen entdecken und als neu erkannten Pflanzenspecies. <em>Bulletin Scientifique Publié par l’Académie Imperiale des Sciences de Saint-Pétersbourg [St. Petersburg &amp; Leipzig]</em> II (20): 311–314. [https://www.biodiversitylibrary.org/item/43693#page/390/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nordmann, A.[D.] von. (1865) Christian Steven, der Nestor der Botaniker. <em>Archiv für Wissenschaftliche Kunde von Russland</em> [<em>Physikalisch-mathematische Wissenschaften</em>] 24: 80–124. [https://archive.org/details/archivfrwissens05ermagoog/page/80/mode/2up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Rolfe, R.A. (1919 [1 December]) <em>Cotyledon oppositifolia</em>. <em>Curtis’s Botanical Magazine</em> 145 [“XV of the Fourth series; CXLV of the whole series”]: tab. 8822. [https://www.biodiversitylibrary.org/page/470260#page/131/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Salisbury, R.A. (1796 [Nov.–Dec.) <em>Prodromus stirpium in horto ad Chapel Allerton vigentium</em>. Self-published, Londini [London], 422 pp. [https://www.biodiversitylibrary.org/page/1484964#page/314/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Salisbury, R.A. (1805 [1 June 1805]) <em>The Paradisus Londinensis: or coloured figures of plants cultivated in the vicinity of the metropolis</em> 1. Published by William Hooker, No. 6, Frith Street, city not stated, presumably London, 157 pp. &amp; 117 plates. https://doi.org/10.5962/bhl.title.53520</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Schmalfuß, L. (2017) Alwin Berger: his life, his family and friends. [<em>In</em>: M. Mariotti &amp; L. Minuto (eds.) Alwin Berger and others. The signs of German culture in the gardens and in the Riviera landscape before and after the Great War. Proceedings of a conference held on 28 October 2016 organised by Università degli Studi di Genova, Centro Servizi di Ateneo per i Giardini Botanici Hanbury, with the support of the Alwin Berger Archiv, Möschlitz, Germany. Giardini Botanici Hanbury, La Mortola, Ventimiglia, Italy.] <em>Bollettino dei Musei e degli Istituti Biologici dell’Università di Genova</em> 79: 9–16.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2020a) The kalanchoes (Crassulaceae subfam. Kalanchooideae) of Raymond-Hamet (1890–1972). <em>Bradleya</em> 38: 120–140. https://doi.org/10.25223/brad.n38.2020.a15</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2020b) Typification of the infrageneric names published in <em>Kalanchoe</em> (Crassulaceae subfam. Kalanchooideae) by Alwin Berger. <em>Phytotaxa</em> 453 (1): 52–54. https://doi.org/10.11646/phytotaxa.453.1.6</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2022) Notes on <em>Kalanchoe</em> subg. <em>Bryophyllum</em> (Crassulaceae subfam. Kalanchooideae) and the kalanchoes of Sijfert H. Koorders (1919). <em>Phytotaxa</em> 549 (1): 87–96. https://doi.org/10.11646/phytotaxa.549.1.7</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. &amp; Figueiredo, E. (2011) <em>Umbilicus rupestris</em>: an interesting member of the Crassulaceae in Portugal. <em>Cactus &amp; Succulent Journal (U.S.)</em> 83: 232–235.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. &amp; Figueiredo, E. (2018) The infrageneric classification and nomenclature of <em>Kalanchoe </em>Adans. (Crassulaceae), with special reference to the southern African species. <em>Bradleya </em>36: 162–172. https://doi.org/10.25223/brad.n36.2018.a10</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. &amp; Figueiredo, E. (2022) <em>Aloe hankeyi</em> (Asphodelaceae subfam. Alooideae;<em> Aloe</em> sect. <em>Leptoaloe</em>), a new species from northern South Africa. <em>Phytotaxa</em> 549 (1): 122–126. https://doi.org/10.11646/phytotaxa.549.1.12</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. &amp; Monro, A.M. (2022a) The nomenclature and taxonomy of Crassulaceae subfam. Kalanchooideae resolved. <em>Phytotaxa</em> 555 (3): 241–251. https://doi.org/10.11646/phytotaxa.555.3.3</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. &amp; Monro, A.M. (2022b) (2908) Proposal to reject the name Crassulaceae subfam. Cotyledonoideae (Crassulaceae). <em>Taxon</em> 71 (4): 910–911. https://doi.org/10.1002/tax.12778</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stafleu, F.A. &amp; Cowan, R.S. (1976) <em>Taxonomic literature. A selective guide to botanical publications and collections with dates, commentaries and types</em>, 2nd edn, Vol. I: A–G. Bohn, Scheltema &amp; Holkema, Utrecht, 1066 pp. [<em>Regnum Vegetabile</em> 94], 1136 pp. [https://www.biodiversitylibrary.org/page/33120900#page/817/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stafleu, F.A. &amp; Cowan, R.S. (1979) <em>Taxonomic literature. A selective guide to botanical publications and collections with dates, commentaries and types</em>, 2nd edn, Vol. II: H–Le. Bohn, Scheltema &amp; Holkema, Utrecht/Antwerpen / dr. W. Junk b.v., Publishers, The Hague. [<em>Regnum Vegetabile</em> 98], 991 pp. [https://www.biodiversitylibrary.org/page/33069049]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stafleu, F.A. &amp; Cowan, R.S. (1985) <em>Taxonomic literature. A selective guide to botanical publications and collections with dates, commentaries and types</em>, 2nd edn, Vol. V: Sal–Ste. Bohn, Scheltema &amp; Holkema, Utrecht/Antwerpen / dr. W. Junk b.v., Publishers, The Hague/Boston [<em>Regnum Vegetabile</em> 112], 1066 pp. [https://www.biodiversitylibrary.org/page/33333981]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stapf, O. (1908) 943. <em>Kitchingia uniflora</em> Stapf [Crassulaceae].<em> In: </em>XXXIV. Diagnoses africanae: XXIII, pp. 258–259. <em>Bulletin of Miscellaneous Information, Royal Gardens, Kew</em> 1908 (6): 257–262. [https://www.biodiversitylibrary.org/page/11624747#page/266/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stapf, O. (1909) <em>Kitchingia uniflora</em>. Madagascar. Crassulaceae. <em>Curtis’s Botanical Magazine</em> 135 [“V of the Fourth series; CXXXV of the whole series]: tab. 8286. [https://www.biodiversitylibrary.org/item/14261#page/227/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stapf, O. (1929) <em>Index Londinensis to illustrations of flowering plants, ferns and fern allies</em> [<em>…</em>]. Vol. I. [‘Introduction’ and ‘Key To The Use Of The Index’ on pp. ix–xiii.] Clarendon Press, Oxford, 547 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;">Stapf, O. (1930) <em>Index Londinensis to illustrations of flowering plants, ferns and fern allies</em> [<em>…</em>]. Vol. II. [<em>Chiastophyllum</em> on pp. 176, 316, and 317.] Clarendon Press, Oxford. 548 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;">Stapf, O. (1933 [2 January]) <em>Leptaloë albida</em>. South Africa. <em>Curtis’s Botanical Magazine</em> 156: tab. 9300.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stearn, W.T. (1941) Ledebour’s “Flora Rossica”, “Icones Plantarum Novarum” and “Flora Altaica” with a note on Pallas’ “Flora Rossica”. <em>Journal of the Arnold Arboretum</em> 22 (2): 225–230. [https://www.biodiversitylibrary.org/item/33598#page/245/mode/1up]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stephenson, R. (1994) <em>Sedum: cultivated stonecrops</em>. Timber Press, Portland, Oregon, 335 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;">Thiede, J. &amp; Eggli, U. (2007) Crassulaceae. <em>In</em>: Kubitzki, K. (ed.) <em>The families and genera of vascular plants. IX. Flowering Plants. Eudicots</em>. Springer-Verlag, Berlin, pp. 83–118.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Trautvetter, E.R. (1837) <em>Grundriss einer Geschichte der Botanik in Bezug auf Russland</em>. Aus der Druckerei der Kaiserl. Akademie der Wissenschaften, St. Petersburg, 145 pp.; ‘Contents’ on pages III–V. [https://books.google.com.au/books?id=jvFhAAAAcAAJ&amp;pg=PA65#v=onepage&amp;q&amp;f=false]</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. &amp; Smith, G.F. (eds.) (2018) <em>International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017</em>. Koeltz Botanical Books, Glashütten. [Regnum Vegetabile 159], 254 pp. https://doi.org/10.12705/Code.2018</span></span></span></p>
<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>
<p>&nbsp;</p>