With a Pictura invisibilis I might be tempted to say Erythronium americanum - Trout lily.

Today is clearly not my day to post a photo. And sadly (or gladly) there are dozens of yellow spring flowers! This one isn’t a trout lily...but it may remain a mystery forever.

jan

Try checking at this site w/ yellow wildflowers in your area: Ontario yellow wildflowers

If you post the photo as a comment and reduce the size, that will make posting easier. Typically choosing large rather than original size works for me, and I have very slow rural internet.

I agree, failure to load may be due to the image being too large.

Thanks all...the owner of the yellow flower has identified it as a yellow epimedium...the flower is quite a different shape than the common red epimedium in my garden. That’s an excellent link party-music 50 thank you.

jan