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University of Reading Herbarium Specimens Online

http://www.herbarium.reading.ac.uk/index.php

This is great for:

Phanerogams: Europe, especially Great Britain and Ireland, the Iberian Peninsula, North Africa (especially Morocco), Macaronesia, the Middle East, cool temperate South America; Pteridophytes: worldwide; Bryophytes: worldwide; Lichens: Europe, especially Great Britain and Ireland, Morocco.

Also there is a Mediterranean Plants Identification and Distribution Link.

Database of Valencian flora (Spain) with mapping

http://bdb.cth.gva.es/

Click on "Buscador" to add genus/species name. Then Buscar and then on the various symbols to see distribution maps, Legal status (E. legal - i.e. in IUCN, habitat directives), photos etc.