On Monday I wrote:
Saw these two at High Mountain a little while ago. Can you I.D. both?
Several folks responded correctly: Butter & Eggs on the left; American Witch-hazel on the right.
Diane Van Kempen added:
Common toadflax and witch hazel (I assume the native one, if it was blooming in October or November).
The toadflax would appear to be invasive.