Abstract
The taxonomy and nomenclature of Kalanchoe ×vadensis (Crassulaceae subfam. Kalanchooideae) [hybrid formula: K. blossfeldiana × K. marmorata var. somaliensis], an artificially produced amphidiploid, are discussed and clarified. An amplified description is provided for the nothospecies. The name K. ×vadensis is epitypified.
References
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Watson, W. [as “W.W.”] (1902 [24 May]) New and interesting plants. Kalanchoe kewensis. Ornithogalum kewense. Cymbidium rhodochilum. Pitcairnea cœrulea. The Garden (London, 1871–1927) 61 (No. 1529): 338–339. [https://www.biodiversitylibrary.org/item/79275#page/356/mode/1up]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wight, R. & Walker-Arnot, G.A. (1834) Prodromus floræ peninsulæ indiæ orientalis : containing abridged descriptions of the plants found in the Peninsula of British India, arranged according to the natural system. Vol. I. Parbury, Allen, & Co., London. [https://www.biodiversitylibrary.org/page/3608847#page/398/mode/1up]</span></span></span>
<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. & VIII.). Journal of the Linnean Society, Botany 18: 264–281. [https://www.biodiversitylibrary.org/item/8373#page/271/mode/1up]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Baker, J.G. (1892 [10 September]) New or noteworthy plants. Kalanchoe marmorata, Baker, n. sp. The Gardeners’ Chronicle. [A weekly illustrated journal of Horticulture and Allied Subjects], 3<sup>rd</sup> ser., XII (No. 298) 300. [https://www.biodiversitylibrary.org/item/83803#page/316/mode/1up]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Baker, J.G. (1895) CCCCLXXV.—Diagnoses africanæ, VII. (continued from p. 153) [Kalanchoe somaliensis Baker on p. 214]. Bulletin of Miscellaneous Information. Kew 1895: 211–230. [https://www.biodiversitylibrary.org/item/127378#page/215/mode/1up]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Baldwin, J.T. Jr. (1938 [October]) Kalanchoe: the genus and its chromosomes. American Journal of Botany 25: 572–579. https://doi.org/10.1002/j.1537-2197.1938.tb09263.x</span></span></span>
<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. Unterfam. II. Kalanchoideae [sic, Kalanchooideae]. 6. Kalanchoe Adanson. 7. Kitchingia Baker. 8. Bryophyllum Salisb. In: A. Engler & K. Prantl (eds.) Die natürlichen Pflanzenfamilien. edn 2, 18a. Verlag von Wilhelm Engelmann, Leipzig, pp. 378–386, 402–412.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Bijmoer, R., Scherrenberg, M. & Creuwels, J. (2021) Naturalis Biodiversity Center (NL) - Botany. Naturalis Biodiversity Center. Occurrence dataset https://doi.org/10.15468/ib5ypt accessed via GBIF.org on 2021-11-16. [https://www.gbif.org/occurrence/2517740184]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Bloemen Bureau Holland. (1999/2000) Potplanten, pot plants, Topfpflanzen, plantes en pot, piante da vaso, planta en particular. 1999/2000. Bloemen Bureau Holland, Leiden, 150 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Boom, B.K. & Zeilinga, A.E. (1964 [September]) Kalanchoe ×vadensis spec. nova. Succulenta [Netherlands] 43 (9): 122–124.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Britten, J. (1871) Order L. Crassulaceae. 4. Kalanchoe, Linn.; Benth. et Hook. f. Gen. Pl. i. 659. In: Oliver, D. (ed.) Flora of Tropical Africa (Leguminosae to Ficoideae) 2. L. Reeve & Co., London, pp. 390–398. [https://www.biodiversitylibrary.org/item/124#page/391/mode/1up]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Christensen, B., Sriskandarajah, S., Serek, M. & Müller, R. (2008) Transformation of Kalanchoe blossfeldiana with rol-genes is useful in molecular breeding towards compact growth. Plant Cell Reports 27: 1485–1495. https://doi.org/10.1007/s00299-008-0575-0</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Flower Council of Holland. (2004) Plants from Holland naturally. 2005/2006. Potplanten, pot plants, Topfpflanzen, plantes en pot, piante da vaso, plantas de maceta. Flower Council of Holland, Leiden, 134 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Friedmann, F. (1971) Sur de nouveaux nombres chromosomiques dans le genre Kalanchoë (Crassulacées) à Madagascar. Candollea 26: 103–107.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Heerlien, M., Van Leusen, J., Schnörr, S., De Jong-Kole, S., Raes, N. & Van Hulsen, K. (2015 [February]) The natural history production line: an industrial approach to the digitization of scientific collections. ACM Journal on Computing and Cultural Heritage 8 (1): Article 3, 12 pp. https://dx.doi.org/10.1145/2644822</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hooker, J.D. (1901 [March]) Kalanchoe bentii. Native of Southern Arabia. Nat. Ord. Crassulaceæ. Curtis’s Botanical Magazine[, comprising the plants of the Royal Gardens of Kew, and of other botanical establishments in Great Britain; with suitable descriptions;] 3<sup>rd</sup> ser., LVII (or Vol. CXXVII of the whole work [No. 675 or No. 1369 of the entire work]): t. 7765. [https://www.biodiversitylibrary.org/item/14255#page/55/mode/1up]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">IPNI. (2022) [continuously updated] The International Plant Names Index. Available from: https://www.ipni.org/ (accessed 2022).</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Izumikawa, Y., Nakamura, I. & Mii, M. (2007) Interspecific hybridization between Kalanchoe blossfeldiana and several wild Kalanchoe species with ornamental value. Acta Horticulturae 743 (XXII International Eucarpia Symposium, Section Ornamentals, Breeding for Beauty - Part II): 59–65. https://doi.org/10.17660/ActaHortic.2007.743.7</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kingsbury, N. (2009) Hybrid. The history and science of plant breeding. The University of Chicago Press, Chicago and London, 493 pp.</span></span></span>
<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 Kalanchoë Schumacheri vom Idjen-Plateau und Revision der Crassulaceae von Java. (Mit 2 lithographischen Tafeln.). Bulletin du Jardin Botanique de Buitenzorg 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 align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kroon, G.H. (1994) A note on the origin of Kalanchoë ×vadensis Boom & Zeilinga (Crassulaceae). Euphytica 76: 125. https://doi.org/10.1007/BF00024029</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kroon, G.H., De Jong, J. & Van Raamsdonk, L.W.D. (1989) Evaluation of the genus Kalanchoe for breeding of new cutflowers and potplants. Acta Horticulturae (International Symposium on the Development of New Floricultural Crops) 252: 111–116. https://doi.org/10.17660/ActaHortic.1989.252.14</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kuang, Y., Lu, C.-H. & Hsu, F.-C. (2021) Restoring fertility for novel interspecific hybrids between Kalanchoe garambiensis and K. nyikae using colchicine treatment. Plants 10: a209, 16 pp. https://doi.org/10.3390/plants10020209</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kuligowska Mackenzie, K., Lütken, H., Lopes Coelho, L., Dibbern Kaaber, M., Nymark Hegelund, J. & Müller, R. (2018) Chapter 19. Kalanchoë. In: J. van Huylenbroeck (ed.) Handbook of Plant Breeding. Vol. 11. Ornamental crops. [Editors-in-Chief, I. Rajcan & J. Vollman.] Springer International Publishing AG, part of Springer Nature, Cham, Switzerland, pp. 453–479.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Orton, T.J. (2019) Horticultural plant breeding. Academic Press, an imprint of Elsevier, London, San Diego, Cambridge (U.S.A.), and Oxford, 400 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Perrier de la Bâthie, [J.M.]H.[A.] (1928 [Février]) Observations nouvelles sur le genre Kalanchoe. Archives de Botanique II, Bulletin Mensuel. Caen 2 (2): 17–31.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Raadts, E. (1983) Cytotaxonomische Untersuchungen an Kalanchoë (Crassulaceae) 1. Kalanchoë marmorata Baker und 2 neue Kalanchoë-Arten aus Ostafrika. Willdenowia 13 (2): 373–385. [https://www.jstor.org/stable/3995856]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Raadts, E. (1989 [September]) Cytotaxonomische Untersuchungen an Kalanchoë (Crassulaceae) 3. Chromosomenzahlen ostafrikanischer Kalanchoë-Sippen. Willdenowia 19 (1): 169–174. [https://www.jstor.org/stable/3996938]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Raymond-Hamet. (1933) Observations sur le Kalanchoe uniflora (Stapf) Raymond-Hamet. Bulletin de la Société Botanique de France 80 (4): 542–548. https://doi.org/10.1080/00378941.1933.10833878</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Richard, A. (1847) Tentamen Floræ Abyssinicæ seu Enumeratio Plantarum hucusque in plerisque Abyssiniæ provinciis detectarum et præcipue a beatis doctoribus Richard Quartin Dillon et Antonio Petit (annis 1838–1843) lectarum. Vol. 1. Apud Arthus Bertrand, Editorem, Parisiis, 472 pp. https://doi.org/10.5962/bhl.title.334</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Rowley, G.D. (2017) Succulents in cultivation—breeding new cultivars. The British Cactus & Succulent Society, Hornchurch, Essex, 248 pp.</span></span></span>
<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]) The Paradisus Londinensis: or coloured figures of plants cultivated in the vicinity of the metropolis 1. Published by William Hooker, No. 6, Frith Street, city not stated, presumably London, 157 pp. & 117 plates. https://doi.org/10.5962/bhl.title.53520</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Sharma, A.K. & Ghosh, S. (1967) Cytotaxonomy of Crassulaceae. Biologisches Zentralblatt 86 (supplement): 313–336.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2020a) Plant smart. The big easy. Gardening with Kalanchoe. Veld & Flora 106 (3): 40–43.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2020b) Character inheritance in Kalanchoe ‘Vivien’ Bischofberger (Crassulaceae subfam. Kalanchooideae), a cultivar derived from an interspecific hybrid between two southern African species (K. luciae Raym.-Hamet × K. sexangularis N.E.Br.). Bradleya 38: 3–13. https://doi.org/10.25223/brad.n38.2020.a1</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2020c) Kalanchoe ×estrelae (Crassulaceae subfam. Kalanchooideae): a new nothospecies for the hybrid between K. luciae and K. sexangularis. Phytotaxa 441 (2): 225–228. https://doi.org/10.11646/phytotaxa.441.2.11</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2020d). Zwei Neuzugänge im Kalanchoe-Gartenbau: K. ×estrelae and K. ×gunniae. / Two recent additions to Kalanchoe horticulture: K. ×estrelae and K. ×gunniae. Avonia 38 (4): 322–327.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2020e) Kalanchoe Adans. subg. Fernandesiae Gideon F.Sm. (Crassulaceae subfam. Kalanchooideae), a new subgenus from southern and south-tropical Africa. Haseltonia 27: 2–7. https://doi.org/10.2985/026.027.0101</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2021a) Kalanchoe ×leistneri (K. sexangularis × K. winteri) (Crassulaceae subfam. Kalanchooideae), a new southern African nothospecies. Phytotaxa 509 (2): 248–254. https://doi.org/10.11646/phytotaxa.509.2.8</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2021b) Reinstatement of Kalanchoe [subg. Bryophyllum] sect. Alatae (Crassulaceae subfam. Kalanchooideae) for K. porphyrocalyx and K. uniflora, two Madagascan endemics. Bradleya 39: 177–181. https://doi.org/10.25223/brad.n39.2021.a17</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2021c) How Kalanchoe marmorata (Crassulaceae subfam. Kalanchooideae), a distinctive central and east African species, received its name, and the later, valid publication of K. macrantha by Maire. Phytotaxa 502 (1): 93–100. https://doi.org/10.11646/phytotaxa.502.1.7</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2022a) Notes on Kalanchoe subg. Bryophyllum (Crassulaceae subfam. Kalanchooideae) and the kalanchoes of Sijfert H. Koorders (1919). Phytotaxa 549 (1): 87–96. https://doi.org/10.11646/phytotaxa.549.1.7</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2022b) Kalanchoe sect. Raveta (Crassulaceae subfam. Kalanchooideae) of Raymond-Hamet (1916): a long-overlooked name in K. subg. Kalanchoe. Phytotaxa 550 (2): 208–212. https://doi.org/10.11646/phytotaxa.550.2.10</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. (2022c) The taxonomy of Kalanchoe marmorata Baker (Crassulaceae subfam. Kalanchooideae), a distinctive African species, revisited. Phytotaxa 538 (2): 100–112. https://doi.org/10.11646/phytotaxa.538.2.2</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. & Figueiredo, E. (2018) The infrageneric classification and nomenclature of Kalanchoe Adans. (Crassulaceae), with special reference to the southern African species. Bradleya 36: 162–172. https://doi.org/10.25223/brad.n36.2018.a10</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. & Figueiredo, E. (2020) Kalanchoe ×gildenhuysii (Crassulaceae subfam. Kalanchooideae), a new nothospecies derived from K. millotii and K. tomentosa. Phytotaxa 442 (1): 43–46. https://doi.org/10.11646/phytotaxa.442.1.8</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. & Figueiredo, E. (2022) Nomenclatural notes on the economically important Flaming Katy, Kalanchoe blossfeldiana (Crassulaceae subfam. Kalanchooideae). Phytotaxa 549 (1): 104–110. https://doi.org/10.11646/phytotaxa.549.1.9</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F., Figueiredo, E. & Van Wyk, A.E. (2019) Kalanchoe (Crassulaceae) in southern Africa. Classification, biology, and cultivation. Academic Press, an imprint of Elsevier, London, San Diego, Cambridge (U.S.A.), and Oxford, 328 pp. https://doi.org/10.1016/C2017-0-00602-X</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. & Hankey, A. (2021) Kalanchoe ×forbesiae (Crassulaceae subfam. Kalanchooideae) derived from K. lubangensis × K. sexangularis: towards improved horticultural material. Phytotaxa 528 (5): 290–300. https://doi.org/10.11646/phytotaxa.528.5.3</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F., Klein, D.-P. & Shtein, R. (2021b) A revision of the Malagasy Kalanchoe subg. Kitchingia (Crassulaceae subfam. Kalanchooideae): history, taxonomy, and nomenclature. Phytotaxa 507 (1): 67–80. https://doi.org/10.11646/phytotaxa.507.1.3</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. & Monro, A.M. (2022a) The nomenclature and taxonomy of Crassulaceae subfam. Kalanchooideae resolved. Phytotaxa 555 (3): 241–251. https://doi.org/10.11646/phytotaxa.555.3.3</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. & Monro, A.M. (2022b) (2908) Proposal to reject the name Crassulaceae subfam. Cotyledonoideae (Crassulaceae). Taxon 71 (4): 910–911. https://doi.org/10.1002/tax.12778</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F. & Shtein, R. (2021) A review of horticulturally desirable characters in Kalanchoe (Crassulaceae subfam. Kalanchooideae): variable and deviating vegetative and reproductive morphologies useful in breeding programmes. Haseltonia 28: 106–119. https://doi.org/10.2985/026.028.0110</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Smith, G.F., Shtein, R. & Klein, D.-P. (2021a) Kalanchoe subg. Alatae (Crassulaceae subfam. Kalanchooideae), a new rank for K. sect. Alatae. Phytotaxa 509 (2): 255–258. https://doi.org/10.11646/phytotaxa.509.2.9</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Stapf, O. (1897 [August and September]) 493. Kalanchoe flammea, Stapf. [Crassulaceae]. In: Anonymous, DLXXV.—Diagnoses africanæ, X. [Species 418–599]. Bulletin of Miscellaneous Information of the Royal Botanic Gardens, Kew 1897 (128–129): 243–300. [https://www.biodiversitylibrary.org/item/127162#page/272/mode/1up]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Thiers, B. (2022) [continuously updated] Index herbariorum: a global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. Available from: http://sweetgum.nybg.org/ih/ (accessed 2022).</span></span></span>
<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. & Smith, G.F. (2018) International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Koeltz Botanical Books, Glashütten. [Regnum Vegetabile 159], 254 pp. https://doi.org/10.12705/Code.2018</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Van Nieuwerburgh, M., Boterdaele, D., Coppens, A., De Meyer, H., De Meyer, J., Imschoot, A., Trivier, L. & Van Hulle, M. (eds.) (No date [ca. 1990]) De Belgische sierteelt / L’horticulture Belge / Belgian horticulture / Der Belgische Zierpflanzenbau. Printing office of Het Volk N.V., Ghent, Belgium, 416 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Van Voorst, A. & Arends, J.C. (1982) The origin and chromosome numbers of cultivars of Kalanchoe blossfeldiana Von Poelln.: their history and evolution. Euphytica 31 (3): 573–584.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Veldkamp, J.F. (1980) The Rijksherbarium at 150 years. Taxon 29 (1): 101–104. https://doi.org/10.2307/1219603</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Von Poellnitz, [J.]K.[L.A.]. (1934) XV. Kalanchoe Blossfeldiana. Repertorium specierum novarum regni vegetabilis. Centralblatt für Sammlung und Veröffentlichung von Einzeldiagnosen neuer Pflanzen 35: 159–160. [https://bibdigital.rjb.csic.es/ing/Libro.php?Libro=6015]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Watson, W. [as “W.W.”] (1902 [24 May]) New and interesting plants. Kalanchoe kewensis. Ornithogalum kewense. Cymbidium rhodochilum. Pitcairnea cœrulea. The Garden (London, 1871–1927) 61 (No. 1529): 338–339. [https://www.biodiversitylibrary.org/item/79275#page/356/mode/1up]</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Wight, R. & Walker-Arnot, G.A. (1834) Prodromus floræ peninsulæ indiæ orientalis : containing abridged descriptions of the plants found in the Peninsula of British India, arranged according to the natural system. Vol. I. Parbury, Allen, & Co., London. [https://www.biodiversitylibrary.org/page/3608847#page/398/mode/1up]</span></span></span>