Possibly Cosmos

These are a multitude of flowers I was growing a while ago. I believe from what I remember, they were cosmos. They had a short growing period, followed by budding, in which they were triplets often, beautiful, rose like buds.
Technically, they were not wild, but, grown by me.
Along with this, when they grew flowers, they were pure white, and, had many seeds. They were quickly pollinated. I harvested the seeds after words. They were very thin, and sickle shaped almost. They were also quite long (around half an inch to an inch in length), but, could vary in size, all the way to less than a quarter of an inch. The seeds were quite brown, and the structure was in likeness to a sun flower.
When grown, they grew at first similar to a bean. The way almost fools you into believing the seeds had floated to the top of the soil, but actually, they had been growing. Almost bean like in the system, and often, would grow to an inch tall above ground before the seed coat was split. Their root system was quite a mix of grass and well rooting, but, it was a very fast style of roots. The roots were thin, and white, but, could break through an actual pot when they massed. When transplanting, for the sun flowers and the flowers pictured, it was quite improbable to not break the roots off.
I am willing to post pictures of seeds if needed.
I apologize if they are not aloud for being garden plants.