Larger context to habitats of Pachypodium
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A "biotype" is a group of organisms having the same "genotype"(genetic makeup), as distinguished from the "phenotype", the overall expression of genetic code, of an organism or a group of organisms such as Pachypodium.
The exclusion from humid forests, with exception to "inselbergs," demonstrates an adaptive evolution for Pachypodium species concentrating on open, dry, xeric habitats; according to Rapanarivo et al. Naturally the morphological, "xerophytic"--a plant adapted to living in a dry arid habitat—characteristics of the genus of Pachypodium supports the later condition.
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Yet, according to Rapanarivo et al., this type of dispersal might not be the best method for the genus. Rapanarivo et al.'s study suggested, instead, that seedlings tended to emerge around "mother" plants that presumably have been well-established, rather than on distant outcrops or inselbergs. Evidence for this conclusion is found in the occurrence of P. densiflorum from Kandreho to Zazafotsy where seeds have dropped in between inselbergs and outcrops. Other examples include P. eburneum, P. windsorii, P. inopinatum, and P. decaryi where in all cases seed distribution is restricted; because the wind does not always carry seeds very far from the host plant.
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