Yellow Toadflax is also known as butter and eggs. I looked at the this plant in the Rocky Mountains, near Breckonridge, CO.

Invasive Plants of the US

9. Yellow Toadflax

A podcast about a different invasive plant each week, presented by EB's Rob Nelson. In this first podcasting series Rob decides to take on a subject that he has spent over 4 years studying -- invasive plants. From footage compliled from work around the states, Rob shares quick lessons in invasive plants, so that we can all be a little more educated when it comes to our great outdoors. Join these weekly podcasts, that visually show a unique invader, or problem plant through Rob (and co-host) Hazen's trials through the swamps and woods.

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Invasive Plants of the US