Stigmaphyllon blanchetii is a perennial climbing species native to Brazil, mainly in the Northeast region, usually in sugarcane fields. Considered a weed, it presents aggressive reproduction and invasive behavior and can colonize sugarcane crops through stem and branch sprouts, resulting in several gaps at the beginning of planting and reducing the productivity of harvesting machines. However, the mechanism behind its invasive behavior, in which vegetative propagation through the underground organ plays an important role, is known. The objective of this work was to analyze whether the underground organ of S. blanchetii contributes to the rapid vegetative propagation of this species and define its structural origin and terminology through morpho-anatomical analyses. Morphological analyses were performed with the naked eye and under a stereomicroscope, and the structures were schematized and documented by means of images captured with a digital camera and illustrations. Anatomical analyses were performed using material fixed in FAA 70 and preserved in 70% alcohol. Histochemical tests were also performed. The results revealed that the underground structure is a complex and diffuse system composed of aerial stems, underground stems and three types of roots: primary, lateral, and adventitious. Due to the bipolar stem branching pattern, with aerial and underground branching, the underground structure of S. blanchetii was recognized here as a rhizophore and, through bud formation on hypocotyls and underground stems, it effectively participates in the vegetative propagation of the species.

桔梗（Stigmaphyllon blanchetii）是巴西多年生的攀缘树种，主要分布在东北地区，通常在甘蔗田里。它被认为是一种杂草，具有侵略性繁殖和侵袭性，可以通过茎和枝的新芽定居在甘蔗作物上，从而在种植开始时造成一些缝隙，并降低了收割机的生产率。然而，已知其侵入行为背后的机制，其中通过地下器官的营养繁殖起着重要作用。这项工作的目的是分析是否S. blanchetii的地下器官通过形态解剖学分析有助于该物种的快速营养繁殖，并定义其结构起源和术语。用肉眼在立体显微镜下进行形态分析，并通过用数码相机拍摄的图像和插图对结构进行图解化和记录。使用固定在FAA 70中并保存在70％酒精中的材料进行解剖分析。还进行了组织化学测试。结果表明，地下结构是一个复杂且分散的系统，由气生茎，地下茎和三种类型的根组成：主根，侧根和不定根。由于双极茎的分支模式，加上空中和地下分支，所以S. blanchetii的地下结构 在这里被认为是根茎，通过在下胚轴和地下茎上形成芽，它有效地参与了该物种的营养繁殖。