Few books on medicinal plants are comprehensive

Though medicinal plants have a lot of applications, there are few comprehensive books on medicinal plants
Most of the books available have very limited information, and few photos
For example Medicinal plants in your own yard published by Navakarnataka does not have any information on the insulin plant and leaves , which are used for diabetes treatment
So a person looking for information on medicinal plants has to consult multiple sources to get information on the product, plant and independently verify whether the information is acccurate.