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1.
中国谷精草属的新资料 总被引:6,自引:0,他引:6
本文报道了谷精草属3个新系,7个新种、5个新变种、2个新组合、3个新记录、修正了5个种的特征记载,新归并学名15个,共涉及全国32种8变种中的34个。 相似文献
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中国粗叶木属(茜草科)植物的分类研究 总被引:7,自引:2,他引:5
本文修订了中国产粗叶木属植物,共记录31种、4亚种和10变种。其中,报道了一个新种、1个新亚种、2个新变种、8个新组合和9个分布新记录,新归并学名12个,并且对中国粗叶木属植物文献记载中的一些错误和混淆作了澄清。 相似文献
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山西黄河湿地植被优势种群种间关系 总被引:4,自引:1,他引:3
在样方调查的基础上,应用2×2列联表的Fisher精确检验、Pearson相关系数和Spearman秩相关系数检验了山西黄河湿地植被优势种群的种间关系,分别测定了24个优势种,共73个种对的种间关联。结果表明:(1)2×2列联表的精确检验共有33个种对为正关联,4个种对为负关联;Pearson相关系数有16个种对呈正相关,没有种对出现负关联;Spearman秩相关系数有40个种对呈正相关,4个种对为负关联。(2)2×2列联表的精确检验不能精确反映种对间的数量变化关系,只能反映种对间关联与否;应用Pearson相关系数和Sperman秩相关检验可帮助刻划种对间的数量变化关系。(3)依Spearman秩相关系数的半矩阵图将24个优势种分为旱生、中生、湿生、水生4个生态种组,各生态种组内的种对具有相同的资源利用方式和生态要求。 相似文献
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本文报导了石耳科的八个种,其中新种四个,即阿尔泰石耳,鳞芽石耳、亚石耳及太白石耳;三个种是中国的新分布,即皱石耳、亚光石耳及淡腹疤脐衣;一个种即白根石耳为中国及蒙古的新分布。 相似文献
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报道了中国兰科2个新记录属及5个新记录种:固唇兰属(Plocoglottis)、栖林兰属(Drymoda)、滇南固唇兰(Plocoglottis bokorensis)、栖林兰(Drymoda siamensis)、泰国牛角兰(Ceratostylis siamensis)、景洪白蝶兰(Pecteilis hawkesiana)、三脉贝母兰(Coelogyne trinervis)、浮萍毛兰(Eria spirodela)。对2个属及5个种进行了特征描述,并对比了近似种。 相似文献
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110个种和品种的柑橘属植物叶精油的化学成分 总被引:3,自引:0,他引:3
用双柱毛细管气相色谱和色谱-质谱对我国柑橘属植物叶精油化学成分进行了全面系统分析。共分析了110个种和品种。其中大翼橙类植物3种,香橙类植物12个种和品种,酸橙类植物18个品种,甜橙类植物15个品种,枸橼、柠檬类植物16个种和品种,柚类植物16个种和品种,宽皮柑橘类植物30个种和品种。共鉴定出精油成分72个。通过实验找出了像马蜂柑、蟹橙、罗汉橙、蕉柑等一批有工业利用价值的精油植物;同时为柑橘属植物 相似文献
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菰(Zizania latifolia)是一种多年生挺水植物,为了探讨该植物根、茎和叶的解剖结构、组织化学及其质外体屏障的通透性生理。该文利用光学显微镜和荧光显微镜,对菰的根、茎、叶进行了解剖学和组织化学研究。结果表明:(1)菰不定根解剖结构由外而内分别为表皮、外皮层、单层细胞的厚壁机械组织层、皮层、内皮层和维管柱;茎结构由外而内分别为角质层、表皮、周缘厚壁机械组织层、皮层、具维管束的厚壁组织层和髓腔。叶鞘具有表皮和具维管束皮层,叶片具有表皮,叶肉和维管束。(2)不定根具有位于内侧的内皮层及其邻近栓质化细胞和外侧的外皮层组成的屏障结构;茎具内侧厚壁机械组织层,外侧的角质层和周缘厚壁机械组织层组成的屏障结构,屏障结构的细胞壁具凯氏带、木栓质和木质素沉积的组织化学特点,叶表面具有角质层。(3)菰通气组织包括根中通气组织,茎、叶皮层的通气组织和髓腔。(4)菰的屏障结构和解剖结构是其适应湿地环境的重要特征,但其茎周缘厚壁层和厚壁组织层较薄。由此推测,菰适应湿地环境,但在旱生环境中分布有一定的局限性。 相似文献
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木犀属植物叶柄的比较解剖学研究 总被引:1,自引:0,他引:1
对木犀属(Osmanthus)26种植物叶柄的解剖结构进行了研究.结果表明,木犀属植物叶柄的解剖特征存在比较丰富的变异,叶柄横切面形状有3种类型(U型、V型、Y型),周缘波状、浅波状或近平滑;表皮毛有或无;维管束一般为1大2小,维管束轮廓在种问变异丰富,维管束类型有周韧、近周韧、外韧3种;小叶月桂、牛矢果、厚边木犀、美洲木犀叶柄中央具髓腔,部分种叶柄有硬化细胞或石细胞存在.木犀属植物叶柄的解剖结构特征比较稳定,可作为该属的分种特征. 相似文献
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Epifluorescent and histochemical aspects of shoot anatomy of Typha latifolia L., Typha angustifolia L. and Typha glauca Godr 总被引:1,自引:0,他引:1
Using epifluorescent and histochemical techniques, we examined anatomical differences in the shoot organs of Typha latifolia, T. angustifolia and T. glauca. The leaf lamina of T. latifolia and T. glauca had enlarged epidermal cells and a thickened cuticle above the subepidermal vascular bundles; that of T. angustifolia lacked these characteristics. Leaf sheaths were similar among the species and all lacked the epidermal thickenings found in the lamina. The fertile stems had typical scattered vascular bundles with a band of fibres that was most prominent in T. glauca. The sterile stems were only 1 cm in length and contained a multiseriate hypodermis and a uniseriate endodermis over part of their length. The rhizomes were similar except for a pronounced band of fibres surrounding the central core in T. angustifolia. The rhizome was also characterized by an outer cortical region with a large multiseriate hypodermis/exodermis and a uniseriate endodermis with Casparian bands, suberin lamellae and secondarily thickened walls. 相似文献
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Polyxylic columnar stems covered by persistent leaf bases and found in sediments assignable to the Upper Cretaceous of Bajo
de Santa Rosa, Río Negro Province, Argentina, are described as two new generic entities in the Cycadales. Anatomical characters
are the basis for their being assigned to the Encephalartoideae of the Zamiaceae.Brunoa santarrosensis gen. et sp. nov. is characterized by the presence of polyxyly, cone domes, mucilage cavities, and uniseriate to triseriate
araucaroid, scalariform, or bordered intervascular pitting.Worsdellia bonettiae gen. et sp. nov. has polyxyly, anastomosing medullary vascular bundles, centripetal xylem, mucilage canals, and concentric
extraxylary bundles. Some characters (polyxyly, medullary vascular bundles, and cone domes) were used to determine the systematic
position, while other characters (mucilage reservoirs and centripetal xylem) were used to establish the relationship between
polyxylic and monoxylic forms. 相似文献
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A new genus and species of Cretaceous Cyatheacean tree fern, Heilongjiangcaulis keshanensis gen. et sp. nov., is erected for several permineralized stems collected at the Keshan County in Songliao Basin, Heilongjiang Province, Northeast China. The new taxon is characterized by a dictyostelic, erect stem with dense multicellular scales and surrounded by persistent petiole bases and adventitious roots. The stem contains a central pith lacking medullary bundles, which is surrounded by a dictyostele, and the cortex externally. Each meristele of the dictyostelic ring is enclosed by a sclerenchyma sheath. The pith and cortex are parenchymatous. The proximal petiole bases present a frond trace composed of numerous meristeles, arranged in 1 abaxial and 2 adaxial arcs, with internally projecting bundles on the upper and lateral sides. The feature combination of the new genus is nearly identical to the anatomical structures of modern scaly genera of the Cyatheaceae apart from the absence of medullary bundles. It is interpreted as a primitive representative of early Cyatheaceae, that closely resembles the modern scaly genera, which suggests that in the Cretaceous, the tree ferns in this family were already in possession of most of the anatomical characteristics observed in extant taxa. The fossil records of the stems, petioles, and spores indicate that during the Jurassic and Cretaceous, the Northeastern region of Asia may have been one of the distribution centers of early Cyatheaceae. 相似文献
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RIYAD S. HADDAD J. R. BARNETT 《Botanical journal of the Linnean Society. Linnean Society of London》1989,101(2):241-247
Transverse sections of petioles from the fourteen species of European spiny Astragalus have been examined. Variation between species was found in several anatomical characters including shape of petiole in transverse section; number of cortical layers; number of vascular bundles; amount of collenchyma tissue and shape and abundance of pith cells. Two major groups of species may be recognized on the basis of anatomical features. 相似文献
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博落回(Macleaya cordata)是罂粟科含有异喹啉生物碱的主要药用植物, 其生物碱提取物具有多种药理活性。目前对博落回的研究主要集中在生物碱的成分、活性和药理等方面, 对与其合成、运输、储藏密切相关的发育解剖结构及生物碱组织化学定位研究还未见报道。该文报道了温室中生长的博落回植株形态特征, 并结合徒手切片和改良碘化铋钾沉淀的方法对主要器官(根、茎、叶)的发育结构和生物碱组织化学染色进行了初步分析。结果表明, 博落回发育基本遵循一般双子叶植物的规律。根中生物碱出现在中柱鞘外的薄壁细胞和导管周围。茎和叶柄中的生物碱主要出现在维管束周围, 偶尔也出现在茎的髓细胞中。总体上, 茎中的生物碱积累量少于根。 相似文献
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The genus Penthorum L. consists of two species of perennial herbs, P. sedoides of eastern North America and P. chinense of eastern Asia. Penthorum has long been considered intermediate between Crassulaceae and Saxifragaceae. An anatomical study of both species was undertaken to contribute to a better understanding of the relationships of these plants. Prominent anatomical features of Penthorum include: an aerenchymatous cortex and closely-spaced collateral vascular bundles of stems; one-trace unilacunar nodes; brochidodromous venation, rosoid teeth bearing hydathodes, and anomocytic stomata of leaves; angular vessel elements with many-barred scalariform perforation plates and alternate to scattered intervascular pits; thin-walled non-septate fiber-tracheids; abundant homocellular erect uniseriate and biseriate rays; and absence of axial xylem parenchyma. In general, Penthorum possesses neither the morphological nor the anatomical synapomorphies which define Crassulaceae, and features shared with Saxifragaceae are largely symplesiomorphous. Thus Penthorum is probably best classified in the monogeneric Penthoraceae. 相似文献
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肖德兴 《热带亚热带植物学报》2005,13(6):507-510
报道了波温苏铁Bowenia spectabilis Hook.ex Hook. f)根、茎、叶的解剖结构.根的初生结构由表皮、皮层和中柱三部分组成,为二原型木质部.茎具大量薄壁组织,薄壁细胞富含淀粉粒,维管束为外韧并生.叶柄中含有5-8束维管束,呈弧形排列.羽片叶角质层厚,有小叶脉产生,气孔主要分布在下表皮.根、茎、叶木质部中的管胞主要是螺纹和孔纹管胞,有少量纤维分化;茎中管胞的侧壁呈现凹凸不平,部分管胞具有分枝或分叉现象. 相似文献