Abstract Three currently accepted Sclerosperma species appear to produce four different pollen morphologies. Sclerosperma mannii and S. walkeri pollen share the same distinct reticulate sculpture, but S. profizianum produces three different pollen types (microreticulate, fossulate, and perforate). The pollen morphology suggests that S. mannii and S. walkeri are sister taxa of the same intrageneric lineage. The pollen diversity observed in S. profizianum suggests (a) this taxon is unique regarding its pollen diversity despite being a non-heterostylous plant or (b) that circumscription of S. profizianum as a species may well be in the need of redefinition.

中文翻译：

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非洲硬核植物（槟榔科）的花粉形态

摘要 目前接受的三种硬核植物似乎产生四种不同的花粉形态。Sclerosperma mannii 和 S. walkeri 花粉共享相同的独特网状雕塑，但 S. profizianum 产生三种不同的花粉类型（微网状、微孔状和穿孔状）。花粉形态表明 S. mannii 和 S. walkeri 是同一属内谱系的姐妹分类群。在 S. profizianum 中观察到的花粉多样性表明（a）尽管是非异花植物，但该分类群的花粉多样性是独一无二的，或者（b） S. profizianum 作为一个物种的限制可能需要重新定义。