Dr. Rani Vajravelu’s most extensive training is in Plant Taxonomy. Her taxonomic treatments of angiosperm families were published in a 3-volume Flora of the Tamilnadu Carnatic , 1984. She has contributed to the preparation of the Guide to the Flora of Florida, 1998. Her interests are also in doing scientific illustrations, some of which were published in Florida Plants for Wildlife , 1995 and Florida Wildflowers in their natural communities, 1998.

Dr. Vajravelu has traveled extensively in Europe and SE Asia in relation to her study on Euphorbia, funded by the National Geographic Society and The Explorer’s Club.