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A Taxonomic Investigation of Variation Within cissus quadrangularis l.(Vitaceae) In Kenya

Wuhan University Journal of Natural Sciences 2001年第3期6卷 715-724页

作者： Gituru Wahiti Robert, Wang Qing feng , Wang Yong, Guo You hao College of life Sciences, Wuhan University, Wuhan 430072, China College of life Sciences Wuhan University Wuhan China

Using information from literature as well as records of localities on herbarium specimen labels at the East African Herbarium Nairobi (EA), materials ofcissus quadrangularis l.,C. cactiformis Gilg. andC. quinquangularis Chiov. were collected and new localities were sought. On the basis of the nature of their stem angles, the specimens ofC. quadrangularis were sorted into two variants, A and B. Variant A has smooth stem angles while variant B has rough stem angles. The authors have proposed that variant B should be recognized as a new variety withinC. quadrangularis. Variant A is the type variety ofC. quadrangularis. A map showing the distribution of the two variants in Kenya has been prepared. The rough-edged variant was found to be absent from the low-lying semi-arid regions of northern Kenya. The variants were found occurring in distinct, separate populations but without separate geographical patterns. The results of t-test show no significant difference (p=0.05) between the means of measurements of dimensions of various organs in the two variants. The stem angles of specimens of the two variants were studied under scanning electron microscope (SEM). This showed a clear morphological difference between the two variants. The results of the investigation support the hypothesis that the variation withinC. quadrangularis represents distinct kinds that can be recognized as taxa at infra-specific level.

关键词： key words cissus quadrangularis l vitaceae infra specific variation

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