JSTOR Global Plants is a community-contributed database where hundreds of herbaria worldwide share more than two million high-resolution images of plant type specimens and related information. Partner-contributed reference works and primary sources, such as collectors’ correspondence and diaries, paintings, drawings, and photographs, are also housed in Global Plants. (Updated continuously)
http://digital.library.wisc.edu/1711.web/jstor-plants
This permalink is a direct, persistent URL to the database that will always work and won't break.