Macroptilium gracile (Phaseolinae, Fabaceae) sensu lato is an extremely diverse species distributed from Mexico to Argentina. The taxonomic and nomenclatural history of the species is confusing, due to existing contrasting treatments. All 15 names corresponding to 12 taxa that have often been considered akin to M. gracile were selected here to clarify the identity of this taxonomic aggregate, using morphological, molecular and biogeographical analyses. Univariate and multivariate statistical analyses (nMDS and cluster) of 67 morphological traits were performed on a sample of 109 herbarium sheets. Maximum parsimony and Bayesian inference analyses were conducted using plastid (rpl32-trnL^(UAG), trnK-matK-trnK) and nuclear (ITS/5.8S) DNA sequence data on a sample of 31 accessions belonging to taxa of the M. gracile complex and other Macroptilium spp., using three members of related genera (Phaseolus and Vigna) as outgroups. A database with plant locations per taxa was used to elaborate a distribution map, and the potential habitats were estimated through nMDS analysis. Our morphological, molecular and biogeographic results suggest that members of the M. gracile complex belong to three taxonomic entities, for which a new arrangement is proposed accepting Macroptilium gracile (with two varieties) and M. campestre, including two new nomenclatural combinations (M. gracile var. subcoriaceum and M. campestre). Types for all cited names are indicated where available (with a new lectotype designation). Morphological, ecological and distributional data are reported for each accepted taxon.

中文翻译：

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所述Macroptilium竹叶物种络合物（豆科，蝶形花亚科）：一个综合分类学研究基于形态学，分子和生态数据

Macroptilium竹叶（Phaseolinae，豆科）意义上拉托是分布从墨西哥到阿根廷的一个非常不同的物种。由于现有的对比处理，该物种的分类和命名历史令人困惑。在这里，通常选择12个分类单元的所有15个名称，这些名称通常被认为类似于gracile。M . gracile，以便通过形态，分子和生物地理分析来阐明该分类集合体的身份。对109个标本室表皮样本进行67个形态特征的单变量和多变量统计分析（nMDS和聚类）。使用质体（rpl32-trnL ^（UAG），trnK-matK-trnK）和核（ITS / 5.8S）DNA序列数据，使用相关属的三个成员（菜豆和Vi豆）作为一组，属于细叶分枝杆菌复合体和其他Macroptiltil属的31个种质的样本。使用每个分类单元的植物位置数据库来绘制分布图，并通过nMDS分析估算潜在的栖息地。我们的形态，分子和生物地理学结果表明M的成员。竹叶复杂属于三种分类的实体，其中一个新的装置被提出接受Macroptilium竹叶（有两个变种）和中号。坎佩斯特雷包括两个新的命名法的组合（M.竹叶变种subcoriaceum和中号。坎佩斯特里）。所有引用的名称的类型均在可用的地方显示（带有新的原型选择）。报告每个可接受的分类单元的形态，生态和分布数据。