More cactus flowers

It does seem to be a very good year for cactus plants/flowers this year....  just beside Gertrude's pen are these.....

..... a pinkish purple one...

 ... this yellow one, with a green centre....

 ... and more of the spectacular while flowers....

And here they are all together.....

... the very tallest plants are a different species, I think and so far these only have buds... so much more to come.