The international size of a herbarium sheet is

To understand the anatomy, embryology, physiology, and interrelationships of plants, what should be established?

Which institution maintains an ethnobotanical gallery?

What is the most important function of a botanical garden?

$A$ student of taxonomy was puzzled when told by his professor to look for a key to identify a plant. He went to his friend to clarify what 'Key' the professor was referring to? What would the friend explain to him?

What is a monograph?