Tiny Tuesday - Tiny Flower - TT219

I spotted this tiny flower on some cactus/succulent plants near home. I have no idea what they are but they're perfect for my first week of hosting Tiny Tuesday this month. Please let me know if you recognise them as I'd love to have a name. I've put a another photo of the plant in extras so you can see how tiny the flower is.
I'll be announcing hearts Thursday or Friday :-)