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題名 | Four New Species of Begonia Sect. Coelocentrum (Begoniaceae) from Limestone Areas in Guangxi, China=中國廣西石灰岩地區秋海棠屬側膜組四新種植物 |
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作者 | 古訓銘; 劉演; 彭鏡毅; | 書刊名 | Botanical Studies |
卷期 | 47:2 民95.04 |
頁次 | 頁207-222 |
分類號 | 377.2243 |
關鍵詞 | 德保秋海棠; 假大新秋海棠; 假癩葉秋海棠; 半側膜秋海棠; 秋海棠科; 中國; 染色體數; 廣西; 石灰岩植物; 新種; 側膜組; Begonia debaoensis; Begonia pseudodaxinensis; Begonia pseudoleprosa; Begonia sect. coelocentrum; Begonia semiparietalis; Begoniaceae; China; Chromosome number; Guangxi; Limestone flora; New species; |
語文 | 英文(English) |
中文摘要 | 本文報導中國廣西壯族自治區西南部石灰岩地區的秋海棠屬側膜組(Begonia sect. Coelocentrum)四個新種:德保秋海棠(B. debaoensis)、假大新秋海棠(B. pseudodaxinensis)、假癩葉秋海棠(B. pseudoleprosa)及半側膜秋海棠(B. semiparietalis),提供線繪圖與彩色照片以資辨識,並報導其中三種的染色體數(2n=30)。德保秋海棠與越南秋海棠(B. bonii Gagnep.)相似,區別在於德保秋海棠具有較小的葉片、節間長而纖細的根莖、外花被具有兩種顏色(邊緣粉紅色而中央與基部接近白色);此外,值得注意的是,其雄花發育異常,所有雄蕊都雌性化而於基部產生裸露的胚珠狀構造、頂端產生具有乳突的柱頭狀構造,推測德保秋海棠可能是一個天然雜交種。假大新秋海棠與大新秋海棠近似,區別在於其葉片全綠無斑紋、托葉先端鈍或凹頭,以及具有粗壯且近無毛的根莖。假癩秋海棠與癩葉秋海棠(B. leprosa Hance)外表相似,區別在於前者果實具有三翅以及具有側膜胎座;假癩葉秋海棠亦與越南秋海棠相似,區別在於前者葉片近革質、近於平整、葉上表面具極稀疏的短剛毛或近於光滑,以及葉柄與葉片下表面具有倒伏的細毛。半側膜秋海棠亦與越南秋海棠略似,區別在於前者葉片常有沿主脈分布的白色斑紋、葉上表面被稀疏的剛毛狀柔毛、子房與果實具有較長的腺狀柔毛、子房或果實的上半部呈側膜胎座,中部向基部漸變為中軸胎座。 |
英文摘要 | Four new species of Begonia (sect. Coelocentrum), namely B. debaoensis, B. pseudodaxinensis, B. pseudoleprosa and B. semiparietalis, from the limestone areas in Guangxi Zhuangzu Autonomous Region, southern China are described and illustrated. A somatic chromosome number of 2n=30 is determined for three of them. Begonia debaoensis resembles B. bonii Gagnep., differing in having smaller leaves; a slender rthizome with long internodes; bicolored outer tepals that are pink toward the margins and whitish in the middle; and bearing abnormal, feminized stamens on staminate flower. It is perhaps of hybrid origin. Begonia pseudodaxinensis is similar to B. daxinensis T.C. Ku, differing in the leaves being entirely green and without white maculation; the stipule apex obtuse or emarginated; and the rhizome stout and nearly glabrous. Begonia pseudoleprosa bears a superficial resemblance to B. leprosa Hance (sect. Leprosae), differing in the fruits being winged, trigonous obovoid-ellipsoid and with parietal placentation. It also resembles B. bonii Gagnep., differing in the leaves being subcoriaceous nearly flat and very sparsely setulose or subglabrous on the adaxial surface; and petioles and the main veins on the lower leaf surface being appressed hairy. Begonia semiparietalis is also somewhat similar to B. bonii Gagnep., differing in the leaves having white maculation along main veins and the upper surface sparsely setose-pilose; ovaries and fruits long glandular-pilose; placentation parietal on upper half of the ovary and axile on the lower half. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。