Jane, I grew plants purchased from the Robinetts of this species that were unmarked. Sadly that is past tense. There is a photo on the wiki of one of those flowers. So if the form the Robinetts were selling was a pure yellow one perhaps the seed was too. The latest edition of the Jepson Manual, describes the color as "deep yellow, often red-brown-spotted above base" which would seem to allow unmarked ones. Here's the link for this species on the Jepson Herbarium if you wish to check the rest of the description: <http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl/…>http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl/… Mary Sue