Taxonomic keys are aids for the rapid identification of unknown plants. Flora is an inventory of the plants of a defined geographical region. A herbarium is a safe place for storing specimens as well as providing a suitable atmosphere for research. A monograph is a comprehensive taxonomic treatment of a taxonomic group, generally a genus or a family, providing all taxonomic data relating to that group.

Monograph is the taxonomic aid that can provide a comprehensive account of complete compiled information of any one genus or family at a particular time. Let's understand why this is the correct answer.

1. What is a monograph?
A monograph is a detailed and comprehensive study or treatise on a particular subject, in this case, a specific genus or family. It provides a complete account of the taxonomic information, including descriptions, illustrations, distribution, habitat, and other relevant data.

2. Taxonomic key:
A taxonomic key is a tool used to identify and classify organisms based on their characteristics. It consists of a series of choices or questions that lead to the identification of a particular species. While taxonomic keys are useful for identification purposes, they do not provide comprehensive information about a genus or family.

3. Flora:
A flora is a compilation of information about the plant species found in a particular geographical area. It includes descriptions, illustrations, and distribution data of various plant species. While a flora provides a broader perspective on plant diversity, it does not focus on a specific genus or family in detail.

4. Herbarium:
A herbarium is a collection of preserved plant specimens that serve as a reference for taxonomic research. It contains dried, pressed, and mounted plant specimens along with associated data such as location, collector, and date of collection. While herbarium specimens are valuable resources for taxonomic studies, they do not provide a comprehensive account of a specific genus or family.

5. Dictionary:
A dictionary is a reference book that provides definitions, spellings, and meanings of words. While a taxonomic dictionary may contain information about various taxa, it does not present a detailed account of a particular genus or family.

In conclusion, a monograph is the taxonomic aid that gives a comprehensive account of complete compiled information of any one genus or family at a particular time. It provides in-depth descriptions, illustrations, and other relevant data about a specific taxonomic group, making it an essential tool for taxonomic research and understanding the biodiversity of different organisms.