广西植物Issue(4)：476-486,11.DOI:10.11931/guihaia.gxzw201412023
贵州小檗属植物（小檗科）叶脉序研究
Leaf venation of Berberis (Berberidaceae)in Guizhou
摘要
Abstract
Leaf venation of 28 species and 2 variety species of Berberis (Berberidaceae)in Guizhou were made a com-parative observation to search new taxonomic evidences and make a study of its systematic significance in Berberis by the means of making leaf venation specimens and clearing leaf specimens.The results showed that venation pattern could be divided into five types:semicraspedodromous,festooned semicraspedodromous,simple brochidodromous, festooned brochidodromous and the mixed.The highest vein order is fifth-order course.Primary veins framework were all pinnate and had a single first-order vein,the size included massive,stout,moderate and weak four types and the branching ways include monopodial and sympodial.Major secondary vein framework include two types:one type was that major secondaries branch to the margin,one of the branches terminates at the margin,and the others joined the superjacent major secondary or formed more than one set of loops;the other was that major secondaries joined in a series of prominent arches and loops of secondary gauge or branched into multiple sets of loops of secondary gauge, often with accessory loops of higher gauge and all the major secondaries did not reach the margin,variation of majorsecondaries angle to midvein separately.Interior secondaries present or absent,formed loops of secondary gauge or branched to the base of the leaf and midvein if present;minor secondary course included semicraspedodromous,sim-ple brochidodromous and eucamptodromous;intersecondary veins were complicated,but the average number of in-tersecondry veins per intercostal area were different among the species.Tertiary veins crossed between adjacent sec-ondaries,anastomose with other tertiary veins and secondary veins to form a net or branch without forming a tertiary reticulum.Quaternary and quinternary veins were formed by fourth-order vein and fifth-order vein courses,and al-ways mixed,they anastomosed with other veins to form a net or branch freely and to be the finest vein-order the leaf exhibits,besides,they were also components of freely ending veinlets.The present of the areolation was from poor development to good development.Freely ending veinlets changed from unbranched to branch unequal.Marginal ulti-mate venations included the absent,incomplete,spiked and looped.Most species had leaf teeth along the margin, number of teeth per centimeter and gland characters in the tooth are different among the species,and had identifica-tion values,but other tooth characters such as tooth spacing and shape were complicated and changeful or had little differences among the species,at the same time,venation in the teeth were unstable,too.Besides,leaf teeth had an effect on the leaf venation pattern.Different kinds of leaf venation patterns presented among the species and had a im-portant significance in taxonomy,variations of leaf venation patterns and complicated degrees showed the evolvement characters of the Berberis ;present of the leaf teeth and its characters also had certain significance in taxonomy and systematology.Main leaf venation characters of the species were summarized in a table for the species of Berberis in Guizhou,based on the leaf venation characters with main diagnostic morphologically.关键词
小檗科/小檗属/叶脉序/分类学/贵州Key words
Berberidaceae/Berberis/leaf venation/taxonomy/Guizhou分类
农业科技引用本文复制引用
王永,何顺志..贵州小檗属植物（小檗科）叶脉序研究[J].广西植物,2015,(4):476-486,11.基金项目
国家自然科学基金(30660224) （30660224）
贵阳中医学院研究生教育创新计划项目(ZYYCX14023) （ZYYCX14023）
