Microscopic identification Stem cross-section: The surface cells are oblong or nearly round, the cuticles are fine-toothed; the non-glandular hair is composed of 2-10 cells, and the apex is narrow. The cortex is narrow, with 1-3 rows of thick-cornered cells on the outside and a resinous canal on the inside. Vascular bundles outside the tough type, 20-30 arranged into a ring, the phloem is very narrow, the outer bast fiber bundles, forming a layer of 3-5 layers of cells, the formation of layers between the beam is not obvious; xylem inverted triangle, the catheter is smaller, Diameter 10-36μm, 1-2 rows of ray cells. The pith is very large and there is a hole in the center of the old stem. [1] Leaf surface view: The upper epidermal cell is long or nearly rectangular, and the vertical wall is relatively straight or shallowly wavy. The stomata is indeterminate. A few hairless. The lower epidermis cells are small and irregular, and the pericyclic wall is wavy. Non-glandular hairs are mostly 375-900μm long, often consisting of 4-7 cells. The following cells are nearly square, and the apex is very narrow and long.
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