This Liberty Tana Lawn design, Midnight Floral Eve*, caught my eye when used to make humble potholders over at the Purl Bee a couple of months ago. I can't seem to find it on Liberty's own site, but what they do list is what inspired it. Click here and scroll right down to the bottom and you'll see it mentioned in the Botanical Garden collection. It comes from a large botanical painting, The Herbarium Specimen, by Rachel Pedder-Smith which "brought together art and science, depicting one specimen to represent each flowering plant family painted in the order of a contemporary DNA-based classification system". You can see details of Rachel's exquisite work here (and buy postcards!).
*It also comes in an equally pretty more summery version.