Coleus buchananii (Baker) Brenan

Meerts, Pierre J. & Paton, Alan J., 2024, The genus Coleus (Lamiaceae) in Central Africa (Democratic Republic of the Congo, Rwanda, Burundi), with the description of 15 new species, PhytoKeys 246, pp. 71-178 : 71-178

Coleus buchananii (Baker) Brenan , Mem. New York Bot. Gard. 9: 43. 1954.

≡ Plectranthus buchananii Baker in D. Oliver & auct. suc. (eds.), Fl. Trop. Afr. 5: 402. 1900. Type: Malawi, Shire Highlands, Nakajumbu, 15 Oct 1881, J. Buchanan 365 (holotype K [ K 000431996 ]; isotype E [ E 00193487]).

= Coleus kisanfuensis De Wild. , Contr. Fl. Katanga: 174. & Ann. Soc. Sci. Bruxelles 41 (2): 48. 1921. Type: DR. Congo, Elisabethville [Lubumbashi], Sep 1911, A. Hock s. n. (lectotype BR [ BR 0000008730572 ], designated here), syn. nov.

Description.

Paton et al. (2009: 324), Paton et al. (2013: 263), as Plectranthus buchananii Baker.

Distribution.

Tanzania to S Tropical Africa.

Habitat and ecology.

Dry woodlands, wooded savannah, steppic savannah, often on rocky soil, occasionally on copper-rich soil; 950–1550 m elev.

Additional specimens.

DR. Congo, Haut-Katanga, Upemba, près de la Lufira, 30 Aug 1948, G. F. de Witte 4222 ( BR); Vallée de la Lofoi, près du village Nkonko, 3 Oct 1970, S. Lisowski 23358 ( POZG); Luiswishi, 21 Sep 1984, F. Malaisse 13191 ( BR); Région de Fungurume, colline “ monde arabe ”, 24 Jul 2007; B. Senterre 4676 ( BR); Tantara, autour de la mine, 3 Sep 1977, R. Wechuysen 865, 866, 867 ( BR).

Burundi, Bururi, 1951, A. Becquet 2149 ( BR); Bururi, route Makamba-Dunga, km 20, 21 Sep 1977, M. Reekmans 6378 ( BR).

Notes.

1. Coleus kisanfuensis De Wild. was unplaced in Paton et al. (2019), because the original materials had not been found. The materials were misfiled in BR as “ Coleus hockii De Wild. ” (which is Coleus betonicifolius var. kasomenensis (De Wild.) Meerts & A. J. Paton ). The specimen [ BR 0000008109613 ] indeed bears a label handwritten by De Wildeman as “ Coleus hockii De Wild. ”, but this is obviously a mistake, because the protologue of C. kisanfuensis clearly refers to C. buchananii , not to C. betonicifolius .

2. Lectotypification of Coleus kisanfuensis De Wild. De Wildeman (1921 b) cited two syntypes, i. e. A. Hock s. n. (syntype BR [ BR 0000008109613 ]), DR. Congo, Kisanfu, Sep 1911 and A. Hock s. n. (syntype BR [ BR 0000008732835 ] and [ BR 0000008730572 ]), Elisabethville [Lubumbashi], Sep 1911. The three sheets match the protologue. We designate [ BR 0000008730572 ] as the lectotype because it does not bear the erroneous name Coleus hockii De Wild.