Erigenia bulbosa, also known as harbinger of spring or pepper and salt.

Carrot family (Apiaceae) rather than Portulacaceae.

Thanks for the help esh_ga and floral_uk. I went back to see if I could get some better photos (originals a little overexposed) and all the plants were finished blooming already; I would guess they only bloomed for about a week at most, I guess I will have to wait till next year to get more pix.