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Sang Bai Pi illustrates why a plant name is not enough: the documented drug is root bark of Morus alba, while leaves, fruit, stem bark, and root bark are four distinct materials. Mulberry trees are widespread and familiar, which can create false confidence; a backyard tree is not automatically an authenticated medicinal source. Thin pale root-bark strips, rolled edges, and longitudinal fibers are described in the material record, but morphology becomes less reliable after cutting and cannot reveal contaminants or processing. Harvesting root bark is destructive, so the cited source’s commercial, managed supply chain is important. Do not strip a living tree or infer that ordinary mulberry bark is the same material. The Xie Bai San example records Sang Bai Pi with Di Gu Pi, and the source gives equal amounts in that historical formula; this does not establish a universal ratio, safety for lung or heart disease, or a home remedy for cough. Record the exact species, root versus stem, processing form, and formula version. Evidence from mulberry fruit or leaves cannot be transferred to root bark. A comparison with other mulberry materia helps prevent substitution: Sang Bai Pi is root bark; Sang Ye is leaf, Sang Zhi is twig, and Sang Shen is fruit. The familiar white-mulberry tree may provide several named materials, but the part and source must remain explicit. Root bark strips cannot be made sustainable by taking a small amount from each living root; stripping can damage the tree and commercial quality still depends on controlled processing and testing. The historical Xie Bai San composition belongs to a complete formula with multiple ingredients. Its paired amount should not be converted into a dose for an isolated cough or used to manage wheezing. When studying the AI illustrations, compare the broad tree form with the close-up dried bark, then read the Latin name and part label. This exercise teaches that a correct-looking species can still be the wrong material if the part is wrong. The equal-amount example should always be displayed with its formula name and source, because removing one ingredient changes the context. It is not a validated ratio for a cough, wheeze, or a person with lung disease. The fact that Morus alba is a familiar cultivated tree does not make root-bark harvesting harmless; a living tree can be damaged and the drug material needs controlled provenance. In an atlas, that is a conservation point as much as a medicine-identification point.