Thank you Vicky and Becky.
Yes at first i think it is the yellow and pink like yours Becky, but with addition of orange at center.
I have collect seeds from the plants (dont know the pollen parent). And most of its progeny become pure yellow. Some produce pale pink. The best one is red pink with yellow shade at the back of petal. I just want to cross it (maybe white pollen will resulting nice flower). Thats why i search the name of it. But nursery men just simply call all of them as portulaca.
