1771, The travels of Peter Simon Pallas thru Russia
The link below takes one to a translation from German to French, As yet the original is not yet online. Follow the links in the Biodiversity Heritage library for the Atlas and the other 8 volumes.
http://www.biodiversitylibrary.org/item/129046#page/1/mode/1up
Although flattened out as a herbarium specimen the image below shows one of the earliest representations of Iris tenuifolia
http://www.biodiversitylibrary.org/item/129046#page/121/mode/1up as displayed in the Atlas of Voyages du professeur Pallas, dans plusieurs provinces de l'empire de Russie et dans l'Asie septentrionale
Content
For more information on historic Irises visit the Historic Iris Preservation Society at
-- BobPries - 2014-10-27