Confessions of a hasty photographer and writer. My ever vigilant colleague, Randy Baldwin, General Manager at San Marcos Growers, politely correct my plant identification caption. Here's what he sent along...
Nice job with the zoo on EdHat today. Not sure if anyone else will catch this but I am pretty sure your Senecio mandraliscae in the image with Kalanchoe, Crassula and Euphorbia is actually Cotyledon orbiculata var. oblonga 'Flavida' – what we used to call Cotyledon teretifolia. The leaves are flatter, longer and a little less blue than the Senecio and you can still see the old dried inflorescences.