B 



PLATE 55. Secondary Root Structure. 



A. Transverse Section, Aconite Root. 1. Cork. 2. Stone cells. 3. Cortical 

 parenchyma. 4. Bast fibers. 5. Sieve cells. 6. Cambium. 7. Wood fibers. 

 8. Ducts. 9. Medullary ray. 10. Pith parenchyma (traces). 



B. Powdered Aconite Root. 1. Cork. 2. Stone cells. 3. Parenchyma cells 

 filled with starch. 4. Duct. 5. Starch grains. 6. Fiber. 



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