Thale Cress (Arabidopsis thaliana)

Thale Cress (Arabidopsis thaliana)

Observation - Thale Cress (Arabidopsis thaliana) - UK and Ireland. Description: Another uninvited guest in the garden. I've known it for years but - shamefully - this is the first time I've tried to put a name to it. Rosette of leaves; relatively long flower stalk; tiny white flowers. Anyone know why the common name is a grass?

Another uninvited guest in the garden. I've known it for years but - shamefully - this is the first time I've tried to put a name to it. Rosette of leaves; relatively long flower stalk; tiny white flowers.

Anyone know why the common name is a "grass"?

Edit: title changed to match Tim's ID. Thanks.