There are two Indices on the site, and both are in the form of lists of site content. Both can be accessed by hovering over the “Indices” item on the menu above.
On the one hand is the Plant Index, which lists all plants on the site alphabetically. This can be a quick and convenient way to access all plant content on the site, without going through the respective Genus Pages.
On the other is the Antique Prints Index, which lists all the prints on the site, alphabetically by the name under which they were originally published. Again, it’s a quick way to browse this particular content, although the Antique Prints main menu item also gives you thumbnails.