This small plant grew last summer in a flower pot I bought in the store and most probably is not native. I collected seeds from it and planted a month ago. Now, it is flowering and I still cannot identify it. Most probably, Chenopodiaceae; likely, Atriplex. After that, I am lost. Some pistillate flowers are without distinct bracts. Some are are subtended by a single bract with a single stamen growing from the middle of the bract. Inside - a single ovary. Leaves all narrow oblanceolate, glabrous, entire (some are with tiny tooth at one side).
OK, looks like it solved. Matt Lavin and Patrick Alexander on Flickr called it Monolepis nuttalliana, also from Chenopodiaceae. It spreads over all western and central states. In my photos, it is still in juvenile phase. Anyway, the flower structure is very interesting.
