Herbarium and field study ofXylopia L. (Annonaceae) for the Flora of Peninsular Malaysia and the Flora of Thailand projects has clarified regional diversity patterns within this ecologically significant lowland rainforest genus.Two species groups represented within Southeast Asian floras ai'e delineated, one centred on Xylopia ferruginea (Hook.f& Thomson) Baill.and the other on Xylopia malayana Hook.f & Thomson.In Xho Xylopia ferruginea group, a new species, Xylopia erythrodactyla D.
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Johnson et al. (2015) studied this question.
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