The first is a Tragopogon....

The third is an Asiatic Lily.....

Second one is Clematis Sp..

HTH
Chris

Thanks webkat and Saltcedar! I can't believe how fast you get responses on this forum.

I think the first might be Tragopogon pratensis. It looks a lot like the flower in the webpage below, but mine is more leafy?

The others - Clematis and Lilium - anybody have any idea which species? Thanks.

Here is a link that might be useful: Meadow salsify at CT Botanical Society

Those leaves are not skinny Tragopogon leaves; possibly Hieraceum?
The Lilium is in the 'Oriental' group, not 'Asiatic.'

I'm pretty confident that the clematis is terniflora - sweet autumn.

I agree with Nonmember about the non- Tragopogon. I've been looking at Krigia and hawkweed images for foliage to match.

Possible Hieraciums, and there are many: sabaudum,laevigatum,canadense,vulgatum? *WARNING: you can potentially drive yourself half-crazy trying to ID a hieracium to species*

Or you could just call it hawkweed :)

Thanks for all the replies. Yes that yellow flower looks like it could be in Hieracium genus, but when I checked the USDA website I couldn't identify which species it might be. I am mostly interested in discerning whether this species is native or not. Many that are listed are US natives but a few were introduced.

This flower is pretty weedy in my yard, and it has tenancious roots so it's not the easiest plant to weed. I get worried when something spreads so aggressively.