Anthos

Proyecto Anthos is a website hosted by the Royal Spanish Botanical Garden that has a comprehensive database of Spanish flora. It provides taxonomic information, common names, references, conservation info, pictures, botanical drawings and has a very easy to use and powerful search tool. The site is both in English and Spanish.

The tool I that find most useful is the Geographical Search. It allows you to find in a map (based on Google Maps, and enriched with more information layers) specific locations where a species has been reported to grow. This helps while organizing field trips and also provides information when trying to verify the species of a plant that one has found in a specific location.

As an example, you can see in the following screen capture the location of Pinguicula mundi in Spain (click to enlarge).