Today at my Grandma’s house, I saw these weeds:

This unknown weed has dandelion-like flowers, but the plant stands upright

[Added Jan. 23, 2006] This is Senecio vulgaris (Groundsel). Thanks to Seoras64 on flickr for the ID.

[Added Jan. 23, 2006] This is Erodium cicutarium (Red-stemmed Filaree). Thanks to mschmidt62 on flickr for the ID. Also in the photo is a tiny Anagallis arvensis (Scarlet Pimpernel).

I also saw this weed a few days ago on Broadway Street (San Francisco). I really like the texture on its leaves. Anyone know what this is?

[Added Jan. 23, 2006] This is Urtica dioica (Stinging Nettle). Thanks to urtica on flickr for the ID.