Blooming cacti

Still no success with the lithops seeds, but at least the cacti are starting to put on a good show. A few have already bloomed, many are in full bud and some are currently in flower. The pink flowers above belong to the Echinopsis eyriesii. Normally they come out at night and last no longer than until about noon; this year, however, we have been able to enjoy them for almost two whole days. The large yellow flowers at the back also belong to an Echinopsis, a hybrid variety, but I do not know which. Behind these, you can just see a low Mammillaria elongata, with tiny yellow flowers The short-stemmed flowers in the middle right of the photo belong to what I believe is a Notocactus, perhaps a Notocactus macambarensis. The cactus in the foreground, again with yellow flowers, might also be a Notocactus.