A short note in Global Voices sent me to the Princeton Digital Library of Islamic Manuscripts in search of anything vaguely botanical or agricultural. I found a treatise on botany with charming watercolours of many different plants, some cultivated. Perhaps someone out there who can read classical Arabic can tell us the gist.
Roaming a little further around the Princeton Digital Collections I also came across the Western Americana Photographs Collection, which has some really fascinating stuff. I had no idea that Indians stored acorns in specially constructed caches, for example. But it seems to have been a common practice in the Yosemite Valley.