Julia,
These are different accessions of S. wulfenii from different locations. This shows some of the different clones that have been collected. Note the yellow flowers and the bud-like center to the rosettes. I think we have in our heads that a species one should be all identical. Not true. Just like no two humans is identical, so it is with plants.
OK out to try a few photos while the sun is out. It was pouring just a minute ago.In general this is almost the dullest time of the year for the semps. They almost look drab.
Kevin
