1. Root transverse section showing the cork (ck; parenchyma), secondary phloem (sp), vascular cambium (cam), secondary xylem (sx), small groups of vessels (v), and primary xylem (px)

2. Cork, outermost collenchyma-like parenchyma with sclereids; secondary cortex; and secondary phloem, showing cells with irregularly thickened walls and sclereids (ts).

3. Fusiform sclereids of the secondary phloem (Is).

4. Isolated sclereid in the powder.

5. Rectangular sclereids of the secondary phloem (ls).

6. Scalariform vessel (ls).

7. Simple and compound starch granules.

Chinese Herbs

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