It looks to me like Erigeron annuus, both based on the leaves and on the number of them which you have. It is a problem weed in my garden. If when yours blooms it looks like a fleabane, remove the flower heads ASAP and put them the trash and then remove all the plants. You don't want to let this go to seed!

Thanks on the ID of the first one. I further IDed it to Cyperus Retrorsus The second Is very hearty. The stem resembles a twig, and it takes quite a bit of force to pull that tap root out of the ground. Could it be some type of wild shrub? Edit: Found this vacant lot with 3 foot tall versions of this stuff... Check the links and pics This post was edited by kb850 on Sat, May 11, 13 at 17:50

When you pull one of these weeds, if the roots smells like carrot, it is Queen Anne's Lace. If the plant is hemlock, it will have a replusive musty smell sometimes described as smelling like a mouse. What does a mouse smell like? Normally, but I will not say always because there are some different species of QAL and they don't all look the same, the QAL has tiny hairs on the stems. The stems can be solid green or solid green with teeny tiny red pinstripes. The poisonous hemlock has some purple splotches on its stems. Some QAL, but not all, have a dark flower, variously described in different sources as red, maroon, black or purple, in the center of each flower cluster, but this can be iffy and inconsistent and is not necessarily a reliable indicator. The species of QAL that grows wild at our place never ever has had the oddly colored flower, only the creamy white ones. If you have the QAL, when the plants go to seed (don't let them!), the seed heads curl inward on themselves forming something that looks a little like a bird nest. Also, the poisonous hemlock usually needs wet ground to grow but QAL can grow in wet or dry ground. And, poisonous hemlock gets taller and more spread out, though the QAL flower heads will spread out a lot and have less tight flowerheads as the seeds mature, so the flower spread isn't always reliable.

Arum italicum on the right. Did the other shiny plants produce yellow flowers? If so it appears to be Ranunculus ficaria. We may need a close up of the plants on the left.