以下为句子列表：
英文: Description: Evergreen trees, up to 25 m high; twigs, buds, petioles, abaxial surfaces of leaves and peduncles covered with yellowish brown rigid hairs.
中文: 形态特徵：常绿乔木，高达25米；小枝、芽、叶柄、叶背和花梗均被黄棕色糙伏毛。
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英文: Early leaf development is artificially divided into three main stages: the initiation of leaf primordium, the establishment of leaf adaxial-abaxial polarity, and the expansion of leaf blade.
中文: 早期叶片发育包括三个主要过程：叶原基的起始，叶片腹背性的建立和叶片的延展。
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英文: Examples include certain species of Lycopodium and Selaginella, which have two rows of lateral leaves and one or two rows of smaller abaxial or adaxial leaves.
中文: 例如石松属和卷柏属，植物体上具有双行较大的侧生叶，还有1行或2行较小的生于近轴面或远轴面的叶。
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英文: Flower-heads narrowly campanulate, 16-19 mm long, ca. 6 mm across, usually 2-4 in terminal clusters; peduncle 2-8 mm; involucral bracts ca. in 7 series, ribbed on abaxial surface, apex spiny.
中文: 叶互生，卵形，长3-5.5厘米，宽2-4厘米，先端短尖，基部近截形，边缘具疏齿，两面被长柔毛，具基出脉3条；叶柄长3-5毫米。
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英文: In this paper the floral ontogeny and the ovary development of Rivina humilis L.were observed.The results showed that (1) the tepal primordia initiated in 2/5 spirals.The abaxial one initiated first,then the adaxial one,finally the lateral two initiated n
中文: 对数珠珊瑚的花器官发生和子房的发育过程进行了观察.结果表明:(1)数珠珊瑚花被呈2/5螺旋状发生,远轴侧的1枚先发生,其次为近轴侧的1枚发生,最后侧方的2枚花被几乎同时发生,第3枚花被在靠近第1枚的位置发生,第2枚和第3枚之间有1个空隙;(2)4枚雄蕊是同时发生的;(3)心皮发生于分生组织的远轴侧,心皮原基形成后,向上向轴生长,在子房成熟前在近轴侧非正中位形成1个孔,该孔为心皮最终愈合前的残迹,到子房成熟时,因子房的生长孔被挤压缩小,在进一步的生长过程中愈合.子房由1枚心皮构成;(4)从子房发育过程的切片
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