I collected seeds from the plant in the first photo, which I believed I had identified as evening primrose. I understood the evening primrose to be a biennial plant which formed a basal rosette in the first year (second photo) and produced a stalk the second year with flowers. The third and fourth photos show what I have growing from the seeds. The plants do resemble the original plant in the first photo, but if they are, indeed evening primrose, they seemed to have skipped the basal rosette stage.
Can anyone clear any of the confusion up? Maybe I have mis-identified or there are different species of evening primrose.