Literature
Again, in 1997, Pachypodium bicolor was given a full species level by the botanists J.J. Lavranos and S.H.J.V. Rapanarivo in the "Cactus and Succulent Journal" 69: 29-32 (1997).
Its species type is: Madagascar, Toliara, along the Tsiribihina River, Bekinankina, West of Berevo, W. Röösli and R. Hoffman 33/96 (holotype P; isotype MO, TAN, WAG, ZSS). Fig 2, p. 15; Map 2, p. 12; Plates 5-7, opposite p. 17.
G.D. Rowley apparently disagrees with this species definition and maintains another taxonomical ranking altogether in two of his works covering this issue of the taxon, visible in: Homotypic synonym Pachypodium rosulatum variety rosulatum forma bicolor (Lavranos & Rapanarivo) G.D. Rowley in Bradleya 16: 107 (1998) and Pachypodium & Adenium, The Cactus Files Handbook 5: 57 (1999), syn. nov.
So what the reader can make of this taxonomical situation is that there is still considerable debate by very skilled botanists.
This article maintains the species rank of Pachypodium bicolor because of the presence of a white throat, or the corolla tube, is consistent with the authors of the most recent book to undertake a widespread examination of Pachypodium in situ, or in the landscape, of continental southern Africa and Madagascar. Furthermore, the taxonomical definition of the taxa as a species has been accepted with the public use of the taxonomical rank, Pachypodium bicolor apparently.
Read more about this topic: Pachypodium Bicolor
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