Kalanchoe subg. Alatae (Gideon F. Sm.) Smith (2023a: 64)

Smith, Gideon F., 2023, A review of the infrageneric classifications proposed for Kalanchoe (Crassulaceae subfam. Kalanchooideae) from the earliest times up to 2000, Phytotaxa 619 (1), pp. 1-38 : 14-15

Kalanchoe subg. Alatae (Gideon F. Sm.) Smith (2023a: 64) .

Basionym:— Kalanchoe sect. Alatae Smith (2021a: 179) .

Type:— Kitchingia uniflora Stapf (1908: 258) , currently accepted name Kalanchoe uniflora (Stapf) Hamet (1910b: 52) , lectotype designated by Smith (2021a: 179).

Infrageneric designations not validly published:—“ Kalanchoe [unranked] Epidendrae ” Boiteau & Mannoni (1948d: 57). (See ‘9. The infrageneric classification of Kalanchoe of Pierre L. Boiteau and Octave Mannoni (1948–1949) ’, below).

“ Kalanchoe subg. Alatae ” (Raymond-Hamet 1933: 547) Gideon F.Sm., Shtein & D.- P.Klein in Smith et al. (2021a: 255).

8. The infrageneric classification of Kalanchoe of Pierre L. Boiteau (1947)

Smith & Shtein (2022) provided an analysis of the classification system proposed for Kalanchoe by Pierre L. Boiteau in 1947. Only a summary is given here.

Boiteau (1947: 7–9) validly published two combinations at the rank of section in Kalanchoe for, respectively, two of the subgenera [ K. subg. Bryophyllum and K. subg. Kitchingia ] recognised at present, as follows:

• Kalanchoe sect. Bryophyllum ( Salisbury 1805: t. 3) Boiteau (1947: 7) for what is here treated as K. subg. Bryophyllum [see below for a discussion].

• Kalanchoe sect. Kitchingia ( Baker 1881: 268) Boiteau (1947: 7) for what is here treated as K. subg. Kitchingia [see below for a discussion].

However, “ Kalanchoe sect. Eukalanchoe ”, nom. inval., proposed for the autonymic K. subg. Kalanchoe , was not validly published because epithets for subdivisions of a genus may not consist of the name of the genus with the prefix “ Eu -” and a subdivision of a genus that includes the type of the genus must repeat the name of the genus unaltered (see Turland et al. 2018: Art. 21.3 and Ex. 3, and Articles 22.1 and 22.2) ].

Boiteau (1947: 7–8) explained that he treated both Bryophyllum and Kitchingia at the rank of section rather than that of genus. The recognition by Boiteau (1947) of these two genera as sections was a deviation from Berger (1930), who, 17 years earlier, accepted them, along with Kalanchoe , at genus rank. Note though that Bryophyllum and Kitchingia are here treated at the rank of subgenus, not section, nor genus.

For the nomenclatural treatment of Kalanchoe sect. Bryophyllum ( Salisbury 1805: t. 3) Boiteau (1947: 7) at the rank of subgenus, i.e., as K. subg. Bryophyllum (Salisb.) Koorders (1919: 170) , see ‘5. The infrageneric classification of Kalanchoe of Sijfert Koorders (1919) ’, above.

For the nomenclatural treatment of Kalanchoe sect. Kitchingia ( Baker 1881: 268) Boiteau (1947: 7) at the rank of subgenus, i.e., as K. subg. Kitchingia (Baker) Smith & Figueiredo (2018a: 169) , see ‘2. The infrageneric classification of Kalanchoe of Baillon (1885) ’, above.

Apart from these names published at the rank of section by Boiteau (1947), he additionally proposed 14 subsections (as “Sous-Sections”; additionally denoted with the symbol “§”) (see Table 7 , 2 nd column), seven of which were included in K. sect. Bryophyllum , five in “ K. sect. Eukalanchoe ”, i.e., K. sect. Kalanchoe , and two in K. sect. Kitchingia . Boiteau (1947) did not provide Latin diagnoses or descriptions for any of the newly proposed groups. These ‘names’ were therefore not validly published ( Turland et al. 2018: Art. 39.1). Further, Boiteau (1947) did not provide full lists of species, and the species that he did list were allocated only to the three sections he recognised and not to the subsections he proposed.

However, two of the subsection names, Kalanchoe subsect. Trichanthae ( Berger 1930: 406) Boiteau (1947: 9) , as “ Trichantae ”, and K. subsect. Integrifoliae ( Berger 1930: 407) Boiteau (1947: 9) , were new combinations based on the names of unranked taxa validly published by Berger (1930: 406 and 407, respectively) and the new combinations were validly published by Boiteau (1947: 9) in a key [“Clef des Sections et Sous-Sections”] at the rank of subsection. These two names, published at the rank of subsection, are therefore to be cited as follows:

Kalanchoe [sect. Kalanchoe] subsect. Trichanthae (A.Berger) Boiteau (1947: 9) , as “ Trichantae ”.

Basionym:— Kalanchoe [unranked] Trichanthae Berger (1930: 406, as “§ 4”).

Type:— Kalanchoe trichantha Baker (1883: 140) . [Currently accepted name K. synsepala Baker (1882: 110) ].