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                      词条创建者:

                      weizhidan

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                      最近更新:2015-10-26 14:29:39

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                      weizhidan

                      2015-10-26 17:06:55

                      巴马秋海棠Begonia bamaensis
                      编辑

                      Begonia bamaensis Yan Liu & C.-I Peng, Bot. Stud. 48: 465, figs. 1, 2, 3 & 4. 2007.

                      种间区别

                      本种与卷毛秋海棠Begonia cirrosa略似,不同在于叶上表面密生短刚毛或糙硬毛,并在主脉间有白色斑纹,子房表面有白色或红色的柔毛。在电子显微镜下巴马秋海棠的气孔器高度隆起。

                      形态描述

                      Perennialherb; rhizome prostrate, transverse, covered with persistent membranous brownscales and numerous slender fibrous roots, internodes 3-12 mm long. Stipules ovate, caducous. Petiole 7-13 cm long, brown floccose-hirsute.Leaes basal, cordate to ovate, 5-10 cmlong, 4-6.5 cm wide,adaxially reddish-green, hispidulous, abaxially pale brown, slendercurved-hairy, dense on veins and whitish-punctate, palmately veined, basecordate, margin crenulate (teeth apex with short awns), apex shortly caudate orcaudate. Inflorescences dichasial, cymose-liked, axillary, flowerspale red, usually 4 or more. Peduncles ca. 10 cmlong, subglabrous or pilose near flowers. Bracts in pairs, broadly lanceolate,ca. 5 mm long, 2 mm wide, upward gradually smaller.Staminate flower: pedicel ca. 9 mmlong, pilose; bracteoles in pairs; tepals 4, the outer 2 broadly ovate orsuborbicular, 8 mm long,6 mm wide, glabrous, theinner 2 obovate or elliptic, 7-8 mmlong, 1.5-2 mm wide, apexrounded; stamens numerous; filaments slightly connate at base; anthers obovateto oblong, ca. 1 mmlong. Pistillate flower: pedicel 13-15 mm long, pilose; tepals 3;ovary glabrous, unilocular, parietal placentae with 3 bilobate placentas inupside and middle; styles free, bifid; stigma ring-like tortuous, papillose allaround. Capsule nodding,trigonous-ellipsoid, 8-10 cmlong, 8-12 cm wide, apex withpersistent styles, with unequally3-winged, major semiround, 4-6 mmlong.

                      Bot. Stud.Bot. Stud.

                      主要用途

                      模式信息

                      广西省巴马县百魔洞, 24°18’05” N, 107°05’ 58” E,2007-5-19,C.-I Peng 21087 (holotype: IBK; isotype: HAST).

                      分布地区

                      广西省巴马县,石灰岩溶洞洞口。

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