This one showed up a couple of years or so in my garden and has spread since. Probably arrived in soil or bagged amendments. In some ways it is similar to hairy bittercress but the flower is tinier and the leaves are different (they actually are kind of hairy). It is very easy to pull out.

Several photos:



A mighty stand of this stuff:

Check out Arabidopsis thaliana

http://luirig.altervista.org/s...

Yup! That's it!

Thanks **!!Super Sleuth Janet!!**

An interesting side note...this plant is important in plant genetics and was the first plant to have its genome sequenced. I'm a bit nerdy

Kim, I definitely noticed that aspect when I researched the plant!