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首页> 外文期刊>Bothalia: African Biodiversity & Conservation >Pollen morphology and biometry of the genus Androcymbium (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations
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Pollen morphology and biometry of the genus Androcymbium (Colchicaceae) in southern Africa: taxonomic and biogeographic considerations

机译：南部非洲Androcymbium（Colchicaceae）属的花粉形态和生物特征：分类学和生物地理学的考虑

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摘要

Pollen characters in 16 southern African type specimens of Androcymbium Willd. that represent the three sections into which the genus is presently divided (Androcymbium,? Dregeocymbium and? Erythrostictus), were examined to assess the possibility of sectional characterization based on pollen traits and to explore the relationship between pollen traits and geo-graphic species distribution. Differences in pollen grain size, shape, number of apertures and exine pattern, were observed. Principal Component Analysis, using both qualitative and biometric pollen characters, distinguished four groups of species with four different pollen types. Most of the species have a microreticulate exine pattern with either diaperturate or tria- perturate grains. The remaining species have either a rugulate exine pattern with diaperturate grains, or a rugulate-reticu- late exine pattern with thickened (hypertrophied) muri with diaperturate grains. While section Dregeocymbium can be well delimited by the unique thickened muri. and by a significantly larger grain size, no diagnostic pollen traits were found for sections Androcymbium and? Erythrostictus. Similarly, although the six northern African species exhibit a microreticulate exine pattern, the high variability observed for this trait in their southern African counterparts, does not follow a geographic pattern.
机译：非洲南部Androcymbium Willd 16个标本中的花粉特征。代表了当前属的三个部分（Androcymbium，Dregeocymbium和Erythrostictus）被研究，以评估基于花粉性状进行剖面鉴定的可能性，并探索花粉性状与地理物种分布之间的关系。观察到花粉粒度，形状，孔数和外在图案的差异。主成分分析使用定性和生物特征花粉特征，区分了具有四种不同花粉类型的四类物种。大多数种类具有微网状的外ine模式，有不透孔或透孔的谷物。其余的物种要么有具孔的谷粒的波纹状外生花纹，要么有具孔的谷物增厚（肥大）的uri的网状波纹状外ine花样。虽然Dregeocymbium部分可以通过独特的加厚木耳来很好地界定。并且通过明显更大的晶粒尺寸，没有发现Androcymbium和？的诊断花粉性状。赤藓菌。同样，尽管北部非洲的六个物种表现出微网状外壁模式，但在南部非洲对应物种中观察到的该性状的高变异性却没有遵循地理模式。

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