Question

Vein-islet number of Digitalis purpurea is

• A. 2-5.5
• B. 10-15
• C. 10-22
• D. 15-20

Hint:

Digitalis has a very low vein-islet number: 2 to 5.5.

Answer 1

The Correct Option is A

Step 1: Concept
Vein-islet number is a quantitative microscopic constant used to identify leaf drugs.

Step 2: Meaning
It is defined as the number of vein islets per square millimeter of leaf surface between the midrib and the margin.

Step 3: Analysis
For Digitalis purpurea (Foxglove), the vein-islet number is consistently low, typically ranging between 2 and 5.5. Higher numbers usually indicate different species or adulterants.

Step 4: Conclusion
2-5.5 is the established standard vein-islet value for Digitalis purpurea.

Final Answer: (A)