ABSTRACT The genera Adenia Forssk., Crossostemma Planch. ex Benth. and Schlechterina Harms are members of the tribe Passifloreae DC., one of two tribes belonging to Passifloraceae sensu stricto. The genus Adenia is considered the sister group of all Passifloraceae sensu stricto, or as the sister to the other genera of the tribe Passifloreae. Crossostemma and Schlechterina are sister taxa. The objective of the present study was to characterise the pollen morphology of these three genera and to determine whether Adenia is palynologically distinct from the monotypic genera Crossostemma and Schlechterina. Pollen grains of eight species (six of Adenia, one of Crossostemma and one of Schlechterina) were acetolysed, measured, described and illustrated using light and scanning electron microscopy. The pollen grains of the analysed species are medium-sized isopolar monads that are subprolate, oblate-spheroidal or prolate-spheroidal with a subcircular to quadrangular amb and a small polar area; the pollen of Crossostemma and Schlechterina are 3-colporate, while that of Adenia is 4-colporate or rarely 3–4-colporate (in one studied species), and the sexine is reticulate, heterobrochate or homobrochate (Crossostemma), with simplicolumellate walls. The pollen grains of Adenia differ from those of Crossostema and Schlechterina mainly in the number of apertures. Multivariate analysis of the genera studied here, performed with published pollen data for Paropsia Noronha ex Thouars and Barteria Hook. f., revealed the formation of two large groups, one comprising Barteria and another comprising the other genera. Pollen morphology reveals that Paropsia has greater affinity with the genera of the tribe Passifloreae. The results lead to the hypothesis that genera belonging to the tribe Passifloreae possess pollen with fewer apertures than the pollen of taxa of the tribe Paropsieae.

中文翻译：

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Adenia、Crossostemma 和 Schlechterina (Passifloraceae ss) 的花粉多样性：孔径类型及其对进化研究的影响

摘要 Adenia Forssk 属，Crossostemma Planch。前本斯。和 Schlechterina Harms 是 Passiflorae DC. 部落的成员，该部落属于 Passifloraceae sensu stricto 的两个部落之一。Adenia 属被认为是所有 Passifloraceae sensu stricto 的姐妹群，或作为西番莲部落其他属的姐妹。Crossostemma 和 Schlechterina 是姐妹分类群。本研究的目的是表征这三个属的花粉形态，并确定 Adenia 在孢粉学上是否与单型属 Crossostemma 和 Schlechterina 不同。使用光学和扫描电子显微镜对八种花粉粒（六种 Adenia、一种 Crossostemma 和一种 Schlechterina）进行乙酰水解、测量、描述和说明。所分析种的花粉粒为中等大小的等极单子，呈亚长圆形、扁球状或长球状，具有亚圆形至四边形边缘和小极区；Crossostemma 和 Schlechterina 的花粉是 3-colporate，而 Adenia 的花粉是 4-colporate 或很少是 3-4-colporate（在一个研究的物种中），并且性交是网状、heterobrochate 或 homobrochate（Crossostemma），具有单孔状壁。Adenia 的花粉粒与 Crossostema 和 Schlechterina 的花粉粒的不同之处主要在于孔数。对这里研究的属进行多变量分析，使用已发表的 Paropsia Noronha ex Thouars 和 Barteria Hook 的花粉数据进行分析。f.，揭示了两个大类群的形成，一个包含 Barteria，另一个包含其他属。花粉形态表明 Paropsia 与西番莲族的属有更大的亲缘关系。结果导致假设属于 Passifloraee 部落的属具有比 Paropsieae 部落的分类群的花粉更少的孔径。