I was in Big Bend Natl Park in April shortly after they had some rain. Everything was in bloom, there were millions of red ocitillos, but after traveling/hiking all over the park, we spotted a yellow ocitillo. The park ranger later said he had never heard of such a thing and I can't find anything on the net that refers to one being yellow. I know someone somewhere would be interested in knowing about this but do not know who to contact in the plant research world. Photos attached.