In article ,
The Planetary Bill of Rights Project wrote:

I live in the Denver area and while out driving today, saw some amazing
flowers they were growing on a parkway.

They were small yellow flowers in a kind of conical vertical spray shape,
about a foot long and pointed at the sky, with the smaller top of the cone
truncated.

Does anyone know what those are, please?

Sounds like Ratibida columnifera (Prairie Coneflower or Mexican Hat).