(2947) Bryophyllum triangulare Blanco, Fl. Filip., ed. 2: 221. 1845 [Angiosp.: Crassul.], nom. utique rej. prop. Typus: non designatus. In 1869, John Gilbert Baker (1834–1920) was appointed as the first assistant in the Herbarium of the RBG Kew and in this capacity he was provided with large volumes of often undescribed plant material that was collected in various parts of the world, including in Madagascar. Kalanchoe tomentosa Baker (in J. Bot. 20: 110. 1882), inter alia described as “A succulent perennial, densely coated throughout with short brown spreading hairs”, was one of the taxa that Baker (l.c.) described based on material collected in central Madagascar by the Reverend Richard Baron (1847–1907). Thirty-seven years earlier, Francisco Manuel Blanco (1778–1845) published the name Bryophyllum triangulare Blanco (Fl. Filip., ed. 2: 221. 1845) without an indication of the origin of the material. Curiously, Blanco (l.c. 1845) apparently recognised Bryophyllum Salisb. (Parad. Lond.: t. 3. 1805) in preference, rather than in addition, to Kalanchoe Adans. (Fam. Pl. 2: 248. 1763). However, Bryophyllum is at present treated as a subgenus in Kalanchoe, as K. subg. Bryophyllum (Salisb.) Koord. (in Bull. Jard. Bot. Buitenzorg, sér. 3, 1: 170. 1919). Although not mentioning the hairy character of his material, the description of Bryophyllum triangulare provided by Blanco (l.c. 1845) largely coincides with that of material consistently known as K. tomentosa. Blanco (l.c. 1845) inter alia stated: “Hojas sesiles, opuestas, muy carnosas, lanceoladas, y de tres ángulos como de figura de bayoneta, enterisimas. Cal. como en la especie anterior. Cor. muy larga, con cuatro ángulos, y el limbo con cuatro lacinias. […]. Espec. nueva” (Leaves sessile, opposite, very fleshy, lanceolate, with three angles like the shape of a bayonet, entire. Calyx as in the preceding species [Bryophyllum serratum Blanco (l.c. 1845: 220), where the calyx is described as: “Cal. muy corto, hendido muy profundamente en cuatro partes” (Calyx very short, very deeply divided into four parts)]. Corolla very long, with four angles, the limb divided into four lobes. […]. New species). In the first edition of his Flora of the Philippines, Blanco (Fl. Filip.: 382–383. 1837) provided exactly the same description for Cotyledon lanceolata Blanco (l.c. 1837: 382), non Forssk. (Fl. Aegypt.-Arab.: CXI & 89. 1775), with the sole exception that “otros” was given as “otro” in the 1837 work. By not adopting “lanceolata” in the correct form in Bryophyllum when he transferred C. lanceolata Blanco non Forssk. to Bryophyllum, Blanco was likely following the then widely implemented “Kew Rule” that did not require retention of the epithet of the original species name when a species is transferred to a different genus. Although Blanco (l.c. 1837: 382; l.c. 1845: 221) recorded the leaves of the material he described as B. triangulare as “opuestas” (opposite), which is the common condition in Kalanchoe, the leaves of K. tomentosa are alternately arranged, but especially towards a branch apex often appear to be rosulately clustered or even opposite. Just over 20 years before Bryophyllum triangulare was described by Blanco (l.c. 1845), Karl T. Hilsenberg (1802–1824) and Wenceslas Bojer (1795–1856) made the first significant plant collections in the interior of Madagascar, during an 18-month period, from May 1822 until October 1823 (Dorr, Pl. Coll. Madagascar Comoro Isl.: 52–53. 1997; Figueiredo & Smith in Phytotaxa 568: 185. 2022). Material collected in Madagascar was therefore increasingly being distributed, and evidently had also reached Blanco in the Philippines, with Merrill (Sp. Blancoan.: 161. 1918, Enum. Philipp. Fl. Pl. 2: 217. 1923) later noting that the species was in cultivation. Hamet (in Bull. Herb. Boissier, sér. 2, 7: 899. 1907) included Bryophyllum triangulare, as “B. triangulore”, in the synonymy of a very broadly conceived Kalanchoe laciniata (L.) DC. (Pl. Hist. Succ.: t. 100. 1802). This was in contrast to Merrill (Rev. Blancos Fl. Filip.: 43. 1905) who, likely following Fernández-Villar (Nov. App.: 78. 1880), rather associated the name B. triangulare with K. spathulata DC. (Pl. Hist. Succ.: t. 65. 1801). However, Merrill (l.c. 1918; l.c. 1923) later agreed with Hamet (l.c. 1907) and rather placed the name B. triangulare in the synonymy of K. laciniata. Although a variable species as circumscribed at present, none of the variants of K. laciniata and K. spathulata has leaves that are “very fleshy, lanceolate, with three angles like the shape of a bayonet”, as described by Blanco, who left no herbarium, for B. triangulare, so it would seem inappropriate to neotypify Blanco's name on either of the “illustrative specimens” that Merrill (l.c. 1918) associated with these other names. Rather, B. triangulare was the first description of K. tomentosa, and its treatment as a heterotypic synonym of the latter has been suggested (e.g., https://wfoplantlist.org/plant-list/taxon/wfo-0001299811-2022-12), despite the epithet “triangulare” having to be combined with Kalanchoe, in accordance with Art. 11.4 of the ICN (Turland & al. in Regnum Veg. 159. 2018). The name Kalanchoe tomentosa is consistently in use in works on the taxonomy of Kalanchoe (e.g., Baillon in Bull. Mens. Soc. Linn. Paris 1: 468. 1885; Hamet in Bull. Herb. Boissier, sér. 2, 8: 31. 1908; Raymond-Hamet & Perrier de la Bâthie in Ann. Mus. Colon. Marseille, sér. 3, 3: 102. 1915; Raymond-Hamet & Marnier-Lapostolle in Arch. Mus. Natl. Hist. Nat., sér. 7, 8: 37. 1964; Maire, Fl. Afrique N. 14: 253. 1977; Boiteau & Allorge-Boiteau, Kalanchoe Madagascar: 166. 1995; Descoings in Eggli, Ill. Handb. Succ. Pl. Crassulaceae: 178. 2003; Smith & al., Kalanchoe S. Africa: 299. 2019), as well as for material widely available in the horticultural trade (Jacobsen, Lex. Succ. Pl., ed. 2: 290. 1977; Jacobsen, Handb. Succ. Pl. 2: 631. 1986; Rauh, Succ. Xerophyt. Pl. Madagascar. 1: 92, 93. 1995; Brickell, RHS A–Z Encycl. Gard. Pl., corr. repr.: 578. 1998; Brickell, RHS A–Z Encycl. Gard. Pl., ed. 2, 2: 594. 2003; Bryant & al., Ultimate Pl. Book: 741. 2005). The name K. tomentosa is also in use in the African Plant Database (https://africanplantdatabase.ch/en/nomen/210198), which includes the Catalogue of the Vascular Plants of Madagascar. For over 110 years, the name Bryophyllum triangulare has not featured in any works on Kalanchoe and rejecting it will have no negative nomenclatural effect. Therefore, to avoid a disadvantageous name change and future redundant nomenclatural discussions, the rejection of the name B. triangulare is here proposed, in accordance with Art. 56. GFS, https://orcid.org/0000-0002-5417-9208 Prof. John McNeill, Royal Botanic Garden Edinburgh, U.K., and Dr John Wiersema, Department of Botany, Smithsonian Institution, Washington, D.C., U.S.A., are thanked for kindly commenting on this issue.