Important sites for Indian Flora (Alphabetically) :
Efloraofindia website: /home
Efloraofindia e-group: http://groups.google.com/group/indiantreepix
Forest Flora of Hyderabad State: http://www.forests.ap.gov.in/Forest%20Flora%20of%20Andhra%20Pradesh/Flora%20Index.htm
FRLHT, ENVIS CENTRE ON MEDICINAL PLANTS: http://envis.frlht.org
GRIN Taxonomy for Plants — all families and genera of vascular plants and 50,790 species from throughout the world are represented, especially economic plants and their relatives. Information on scientific and common names, classification, distribution, references, and economic impacts are provided.
India plants: http://www.indiaplants.com/
Multilingual Multiscript Plant Name Database, an exhaustive listing of plants indexed via botanical names whose names can be found for almost all languages on the globe; solo efforts of Michel H. Porcher.
Names of Plants in India: This site makes an attempt to gather and share common names of the plants found in India.
Plants of the World Online
The Plant List: http://www.theplantlist.org/ (The Plant List is a working list of all known plant species. Version 1 aims to be comprehensive for species of Vascular plant (flowering plants, conifers, ferns and their allies) and of Bryophytes (mosses and liverworts).
The Western Ghat Forest Biodiversity Portal:
Trees of the rainforests of the Western Ghats: