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in the north, south to Sierra Leone, Benin and Cameroon. It is sympatric with the nominate form throughout its range. According to Beard in his original 1963 description of the taxon as P. occidentalis, a species independent of P. madiensis, it primarily differs from the nominate form in that the corolla, including outer lobes, is shorter, less than 1.5cm, and the floral tube, into which form

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