Data from: Comparative leaf anatomy of wild Manihot Mill. species (Euphorbiaceae) from Chapada Diamantina, Bahia, Brazil

The leaf anatomy of nine species of Manihot Mill. were studied with the objective of finding anatomical features that contribute to understanding the taxonomy of the genus. Leaf samples were collected in the field and from herbarium specimens, and standardized methods were used for both light and scanning electron microscopy. The following species were studied: M. bellidifolia P. Carvalho & M. Martins, M. brachyandra Pax & K. Hoffm., M. caerulescens Pohl, M. diamantinensis Allem, M. elongata sp. nov. ined., M. jacobinensis Müll. Arg. (I), M. jacobinensis Müll. Arg. (II), M. longiracemosa P. Carvalho & M. Martins, M. maracasensis Ule, M. reniformis Pohl, M. tripartita (Spreng) Müll. Arg. and Manihot sp. Anatomically, the analysis revealed differences that indicate the importance of leaf anatomy in the taxonomy of the species. Presence of fibers in the bundle sheath, presence or absence of papillae and fibers in the midrib are diagnostic characters. Although these characteristics were not enough to separate all of the species, or to group them into a section, they did show some taxonomic importance at the species level. In addition, morphoanatomical differences and geographical distribution support Manihot sp. as a distinct species.

本研究以解析木薯属（Manihot Mill.）的分类学依据为目标，对9个木薯属类群的叶片解剖结构展开研究。研究材料的叶片样品分别于野外采集及从标本馆馆藏标本中获取，并采用标准化流程开展光学显微镜与扫描电子显微镜观察。本次研究涉及的类群如下：雏菊叶木薯（M. bellidifolia P. Carvalho & M. Martins）、短蕊木薯（M. brachyandra Pax & K. Hoffm.）、蓝叶木薯（M. caerulescens Pohl）、迪亚曼蒂纳木薯（M. diamantinensis Allem）、未定名伸长木薯新种（M. elongata sp. nov. ined.）、雅科比纳木薯（M. jacobinensis Müll. Arg.）（I）、雅科比纳木薯（M. jacobinensis Müll. Arg.）（II）、长总状木薯（M. longiracemosa P. Carvalho & M. Martins）、马拉卡斯木薯（M. maracasensis Ule）、肾叶木薯（M. reniformis Pohl）、三裂木薯（M. tripartita (Spreng) Müll. Arg.）以及未定名木薯（Manihot sp.）。解剖分析结果显示，不同类群间存在显著结构差异，这表明叶片解剖特征在该属物种的分类学研究中具有重要价值。维管束鞘纤维的存在、中脉处叶表皮乳突及纤维的有无均可作为该属物种的分类鉴定特征。尽管上述特征不足以完全区分所有类群，亦无法将其划归至相应的组下，但仍在物种水平上体现出一定的分类学意义。此外，形态解剖结构差异结合地理分布特征，证实未定名木薯（Manihot sp.）为独立物种。