Seventeen morphologically related genera have been considered as the Rondeletia complex, traditionally in Rondeletieae. Molecular studies agree that this is a polyphyletic group and some genera have been transferred to Guettardeae. Nevertheless, no solid morphological characters support this hypothesis. Our aim is to explore pollen morphology to see if this source of characters has systematic value. Our study uses light and scanning electron microscopy for 30 species of both tribes representing 14 genera. The most important characters are polar outline, endoaperture type and nexine discontinuities. Our results do not permit diagnosis of tribes, but they show that the genera formerly included in the Rondeletia complex, but now placed in Guettardeae, have nexine discontinuities in polar areas: endofissures (Rogiera) or endocracks (Arachnothryx complex: Arachnothryx-Gonzalagunia-Javorkaea-Renistipula). Palynological data also confirm a close relationship of Rondeletia with Stevensia, corroborating their synonymy, and of Arachnothryx with Gonzalagunia-Javorkaea-Renistipula, providing evidence of their close relationship. We conclude that pollen is a useful source of characters for supporting main lineages, but further research is still necessary for other genera, including Blepharidium, Machaonia, Mazaea and additional Rondeletia spp.

中文翻译：

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Rondeletia配合物（金鸡菊科，茜草科）花粉形态的系统相关性

十七个与形态学相关的属被认为是Rondeletia复合体，传统上在Rondeletieae中。分子研究认为，这是一个多系群，一些属已被转移到圭达那。然而，没有坚实的形态学特征支持该假设。我们的目的是探索花粉形态，以了解这种字符来源是否具有系统价值。我们的研究使用光电子显微镜和扫描电子显微镜对代表14属的两个部落的30个物种进行了研究。最重要的特征是极轮廓，孔内类型和连接不连续。我们的结果不能诊断部落，但它们表明该属以前包括在Rondeletia中复杂，但现在已放置在Guettardeae中，在极地区域出现了不连续的汽油：内裂（Rogiera）或内裂纹（Arachnothryx复杂物：Arachnothryx - Gonzalagunia - Javorkaea-Renistipula）。孢粉数据也证实有密切的关系郎德木属与Stevensia，证实他们的同义词，而Arachnothryx与Gonzalagunia - Javorkaea - Renistipula，提供其密切关系的证据。我们的结论是花粉是字符的支持主要谱系的有用来源，但进一步的研究还需要为其他属，包括Blepharidium，Machaonia，Mazaea和附加郎德木属属。