以下为句子列表：
英文: Centrifugal xylem differentiates from the center outwards, and a centrifugal inflorescence (e.g. the dichasial cyme ) is one in which the progression of flower opening is from the center to the periphery.
中文: 离心式的木质部分化是从中间开始的，离心式的花序中花开放的顺序是从中央到周围。
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英文: Centripetal xylem differentiates from the outside toward the center, and a centripetal inflorescence (e.g. the capitulum) is one in which the outer flowers open before those in the center.
中文: 向心的木质部的分化是从外向内的，向心式的花序（头状花序）是外面的花比中央的花先开放。
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英文: Furthermore, by hierachical clustering, all 25 populations can be classified into 3 groups, in which those with pendulous inflorescence are in the same group and those with upright inflorescences are in the other two groups.
中文: 3)聚类分析表明，不同野生鸭茅种源可划分为3类，其中花序下垂种源聚于一类；而花序直立的种源分居另两类。
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英文: In the daisy family the numerous bracts which subtend the inflorescence are known as an involucre.
中文: 在菊科植物中，苞片数目多而聚生在花序外围，称为总苞。
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英文: Inflorescence an axillary heads; flowers bisexual, petals 5, white, ribbon-like, 1.5 cm long; stamens 5, filaments very short, anthers ovoid, with 2 pollen sac opening each by 2 vertical valves, connectives exserted; staminodes 5, bifid.
中文: 头状花序腋生，花两性，花瓣5，白色，带状，长1.5厘米；雄蕊5，花丝极短，花药卵形，具2个各2瓣裂的花粉囊，药隔突出；退化雄蕊5，叉状分裂。
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