Botanical Nomenclature

Step 1: Understanding the rules of technical presentation
Scientific naming follows strict conventions:
- The author's name should be abbreviated after the specific epithet.
- Both the genus and species names should be printed in italics.
- The first word must denote the genus.
- Underlining is not necessary when handwriting the name.
Step 2: Evaluating the options
Option (1): Includes II, III, and IV. However, IV is incorrect.
Option (2): Includes I and II, but misses III, which is correct.
Option (3): Includes I, II, and III, which are all correct.
Option (4): Includes I, III, and IV, but IV is incorrect.
Step 3: Conclusion The correct answer is:

Step 1: Understanding the different types of botanical references.
A 'Key' is typically used to identify species within a group, 'Manual' is a handy book for identification, 'Flora' describes the plants of a particular region, and a 'Monograph' deals extensively with a single taxon.
Step 2: Determining the correct answer.
Since the question asks for books having information on any one taxon, the best answer is 'Monograph'. A monograph is a detailed study focused on a single taxon, providing comprehensive information on that specific group, which may include anything from a single species to a genus or even a family.