| 滇桐属的花粉形态及其系统位置的探讨 |
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| 作者单位： | (中国科学院华南植物研究所，广州)
(华南农业大学，广州) |
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| 摘 要： | 滇桐属(Craigia w.w.Smith ＆ W．E. Evans)植物的生殖器官与花粉的形态都比
较特殊，一直受到国内外学者的重视，究竟应将它归入梧桐科(sterculiaceae)还是椴树科
(Tiliaceae)，长期以来都存在着不同的见解。为了帮助澄清这个问题，本文在过去研究中国
梧桐科花粉形态的基础上，从花粉形态的角度进行探讨，对滇桐属的花粉以及椴树科的椴属
(Tilia)、海南椴属(Hainania)、蚬木属(Excentrodendron)等4属16种花粉在扫描电子显微镜 和光学显微镜下进行观察。研究结果表明，滇桐属花粉与椴树科3个属的花粉在形状、极性、
萌发孔位置及其形状结构(包括孔室的形状)、表面纹饰等方面都有差异，但与梧桐科的苹婆
属(Sterculia)、梭罗树属(Reevesia)等的花粉形态比较接近，而且滇桐属的花的形态与苹婆属等的也很相似，因此我们认为把滇桐属置于梧桐科内是比较合适的。
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| 关 键 词： | 滇桐属 梧桐科 椴树科 花粉形态 系统位置 |
Pollen Morphology of Craigia with Reference to Its Systematic Position |
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| Authors: | long huo He Li-King Hsue Hsiang-Hao |
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| Institution: | (South China Institute of Botany, Academia Sinica, Guangzhou) (South China Agriculture University, Guangzhou) |
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| Abstract: | Due to the unique floral and pollen morphology of the genus Craigia
its systematic position, whether in the family Sterculiaceae or in the family Tiliaceae,
has often been debated.
In order to add more evidence for solving this problem, a comparative study on
pollen morphology of the genus and 15 species of 3 tiliaceous genera, viz.: Tilia Linn.,
Hainania Merr. and Excentrodendron Chang. et Miau. was carried out under the light
and scanning electron microscope. The result shows that the polarity, the structure
and position of the aperture of Craigia pollen differ from those in Tiliaceae but are
similar to those in Sterculiaceae. From palynology, it is more appropriate to place the
genus under discussion in Sterculiaceae than in Tiliaceae. |
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| Keywords: | Craigia Sterculiaceae Tiliaceae Pollen morphology Systematic position |
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