This visualization shows the petal length distribution for three flower species (setosa, versicolor, and virginica) using a stacked bar chart. The horizontal bars display combined petal length values for each species. Built with D3.js v7, it uses `d3.stack()`, `d3.scaleLinear()`, `d3.scaleBand()`, and `d3.axisBottom()` to render SVG, with color encoding via `d3.scaleOrdinal()`. Interactive mouseover tooltips display exact petal lengths. The data originates from the iris dataset CSV file.