
250px|right|thumb|Sambucus|Elder shoot cut longitudinally to show the broad, solid pith (rough textured, white) inside the wood (smooth, yellow tinged). Scale in millimeters. 250px|right|thumb|Walnut shoot cut longitudinally to show the chambered pith found in this genus. Scale in millimeters. Pith, or medulla, is a tissue in the stems of vascular plants. Pith is composed of soft, spongy parenchyma cells, which in some cases can store starch. In eudicotyledons, pith is located in the center of the stem. In monocotyledons, it extends only into roots. The pith is encircled by a ring of xylem; th
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髓(Pith)是由一群儲存及輸送養分的薄壁細胞所組成的柔軟海綿狀组织。髓分布在雙子葉植物草本和木本植物的莖內;若是單子葉植物,其根部也有髓組織。髓的外圍有木質部組織,而木質部的外圍為韌皮部組織。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).