I don’t know the first but fully formed flowers will help.

I had the second weed in my garden 3 or 4 years ago, But I have forgotten what it was. I waited all summer long for it to open its first flowers and then was very disappointed at the results. I seem to have one popped up in my garden this year as well. Hopefully it will get ided soon ...

UPDATE: Plant has fragrance when rubbed, a lemony sweetish scent. Slender leaves are alternating. I think this is the same type of plant, now with flowers. Please help ID.

Could you show us the leaves of this latest plant you’ve posted? I’m finding it hard to see the similarities with the plant in the first few pictures.

There is a puffy round seedhead bloom.

The leaf has some very small hairs/prickles when you look carefully. Im not totally sure if it is the same plant. The plant is not watered at all so the leaves are probably smaller than if it were watered.

So do you think this is the same as your second plant? I thought you meant the first.

Yes the second plant in my original post.

Last 6 photos are Erigeron canadensis.

The 1st plant looks a bit like Oenothera in leaf, but not flower bud, but I'm guessing Pseudoelephantopus spicata, which would be a record. It is more an eastern species but occurs as far west as Sonora. We should be able to positively ID it once it flowers.