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Begonia×breviscapa (Begoniaceae), a New Intersectional Natural Hybrid from Limestone Areas in Guangxi, China

中國廣西石灰岩地區秋海棠屬新組間雜交種:短葶秋海棠

摘要


本文報導中國廣西壯族自治區石灰岩地區秋海棠屬一新雜交種:短葶秋海棠(Begonia×breviscapa),提供線繪圖與彩色照片以資辨識,並報導其染色體數目(2n=30)。由於該植物與數種秋海棠屬植物共域分布,且花粉可染性極低,人工授粉後不著果,經觀察比較其形態特徵後我們推斷其爲生長在同一石灰岩洞穴的側膜組(sect. Coelocentrum)之多變秋海棠(B. variifolia)與棒果組(sect. Leprosae)的癩葉秋海棠(B. leprosa)之天然雜交種。此爲中國大陸秋海棠屬組間天然雜交之首次報導。

並列摘要


A new natural hybrid, Begonia×breviscapa C.-I Peng, Yan Liu & S. M. Ku, from northwestern Guangxi, China, is described and illustrated. A somatic chromosome number of 2n=30 was determined. Based on morphological features, geographical range, pollen stainability and seed set we conclude that B. ×breviscapa is a natural hybrid between B. variifolia Y. M. Shui & W. H. Chen [sect. Coelocentrum Irmsch.] and B. leprosa Hance [sect. Leprosae (T. C. Ku) Y. M. Shui]. This is the first documentation of natural hybridization between begonias of two different sections in mainland China.

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