Abstract The genera Chionanthus is composed by around 100 species distributed worldwide, in tropical and temperate regions of Asia, Africa, Americas and Australia. In Brazil, Chionanthus is the most abundant genera among the Oleaceae family, with 11 species described, nine of them being endemic. The lack of distinctive morphological aspects hinders the identification of some of these species. The aim of this work is to use the leaf anatomy as a tool to the taxonomy of Brazilian native species of Chionanthus, focusing on displaying features that ease their identification. The anatomy of fully expanded leaves was analyzed from 10 species: Chionanthus crassifolius, C. ferrugineus, C. filiformis, C. fluminensis, C. greenii, C. micranthus, C. parviflora, C. subsessilis, C. tenuis and C. trichotomus. The samples, obtained from herborized plants, were rehydrated and cross-sections were made in the middle of the leaf blade, on the petiole and, also, both of the epidermis were dissociated. The occurrence of common anatomic features to Oleaceae were noticed, such as the presence of sclereids and glandular trichomes. The description of the leaf anatomy has permitted to determine the distinctive characteristics between species, such as the shape of the petiole, the vascular system arrangement in the petiole and in the midvein; the presence of papillate epidermal cells; cuticle ornaments; elongate glandular trichomes, sinuosity on the anticlinal walls of the epidermis, presence of hypodermis; differentiation of the mesophyll; and the contour of the midrib on the abaxial surface.

中文翻译：

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叶解剖学作为一种分类工具，用于鉴定巴西本地种 Chionanthus（木犀科）

摘要 Chionanthus属由约100种组成，分布于世界各地，分布于亚洲、非洲、美洲和澳大利亚的热带和温带地区。在巴西，Chionanthus 是木犀科中最丰富的属，有 11 种被描述，其中 9 种是地方性的。缺乏独特的形态特征阻碍了其中一些物种的鉴定。这项工作的目的是使用叶子解剖学作为巴西本地 Chionanthus 物种分类的工具，重点是展示便于识别的特征。分析了 10 个物种的完全展开叶片的解剖结构：Chionanthus crassifolius、C. ferrugineus、C. filiformis、C.fluminensis、C. greenii、C. micranthus、C. parviflora、C. subsessilis、C. tenuis 和 C. trichotomus . 从草本植物中获得的样品，再水化，并在叶片中间、叶柄上制作横截面，而且，两个表皮都被分离。注意到木犀科常见解剖学特征的出现，例如巩膜和腺毛的存在。叶解剖的描述允许确定物种之间的独特特征，例如叶柄的形状，叶柄和中脉中的血管系统排列；乳头状表皮细胞的存在; 角质层饰品；细长的腺毛，表皮背斜壁上的弯曲，皮下组织的存在；叶肉的分化；以及背面中脉的轮廓。两个表皮都分离了。注意到木犀科常见解剖学特征的出现，例如巩膜和腺毛的存在。叶解剖的描述允许确定物种之间的独特特征，例如叶柄的形状，叶柄和中脉中的血管系统排列；乳头状表皮细胞的存在; 角质层饰品；细长的腺毛，表皮背斜壁上的弯曲，皮下组织的存在；叶肉的分化；以及背面中脉的轮廓。两个表皮都分离了。注意到木犀科常见解剖学特征的出现，例如巩膜和腺毛的存在。叶解剖的描述允许确定物种之间的独特特征，例如叶柄的形状，叶柄和中脉中的血管系统排列；乳头状表皮细胞的存在; 角质层饰品；细长的腺毛，表皮背斜壁上的弯曲，皮下组织的存在；叶肉的分化；以及背面中脉的轮廓。叶解剖的描述允许确定物种之间的独特特征，例如叶柄的形状，叶柄和中脉中的血管系统排列；乳头状表皮细胞的存在; 角质层饰品；细长的腺毛，表皮背斜壁上的弯曲，皮下组织的存在；叶肉的分化；以及背面中脉的轮廓。叶解剖的描述允许确定物种之间的独特特征，例如叶柄的形状，叶柄和中脉中的血管系统排列；乳头状表皮细胞的存在; 角质层饰品；细长的腺毛，表皮背斜壁上的弯曲，皮下组织的存在；叶肉的分化；以及背面中脉的轮廓。