Can you please help me identify this weed/plant that growing in my turf grass here in CO?

Question

See attached photos. Also wondering what the best method to kill them without harming the grass

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Answer 1

We have put our heads together here at Gardening Know How and have not been able to make an id.
This does appear to be a tree, shrub or plant that is reseeding into your yard.
Check the neighborhood and see if you can identify the culprit. Wind or birds could be moving these seeds to your yard.
Also you can take a sample or these images to your County Extension Office.
They may have an answer of what is reseeding in your exact area. They may also be interested in a plant or tree that could become invasive.

https://www.gardeningknowhow.com/extension-search