The minute white flowers were closed as I drew it but they're evidently the standard four-petalled, cross-shaped crucifer design of flower.
The root system doesn't amount to much. The basal rosette of leaves has been nibbled, perhaps by slugs.
As I drew it those long thin seedpods led me guess that it was shepherd's needle. That plant also has similar shaped seedpods but it is a member of the umbellifer family.
Thale cress, Arabidopsis thaliana, was named after the German physician Johann Thal (1542–83). A weed of cultivated ground, hedges and walls it is also known as Common Wall Cress. It flowers in spring and autumn.