Thanks to Daren, I think the mystery has been solved...It's hard to find good photos of Flax, but I found these two videos and they look very much like what I have growing in my yard.
This is what happened... The Alyssum I planted was old, so I guess it never germinated. However, I did spread some Flax seeds last year and forgot all about it, because they never germinated (I cast the seeds all over the place, plus in an area that I observed for a while, but never saw it germinate).
I forgot about this, because I never really intended to grow flax was just curious what it would look like, I had some seeds laying around from a local health food store and I still actually have some in my covert.
Yesterday I looked closely in my garden and I have some other areas that are now growing flax. I don't remember when I threw out these seeds, but it was definitely last year during the summer. I'm guessing they needed a little bit of a cold stratification period before germinating.
What's funny is that I don't remember throwing the flax seeds in the area where I got the most of them (but I was throwing them all over the place) and the ones that I took a picture of and posted here is the same area that I threw the Alyssum, just a few weeks earlier. However, I know that they were Alyssum seeds or at least they were NOT flax seeds, because the size of flax seeds are so much bigger -- I would have noticed it once I opened the Alyssum seed package.
Bottom line: Health food store bought flax seeds