Lappula squarrosa is a species of flowering plant in the borage family known by several common names, including European stickseed,[1] bur forget-me-not,[2] bluebur, and bristly sheepbur.

This is an annual herb producing an erect stem often with sprays of many long, bending branches, its form varying in different regions and climates.

The stems are lined with linear to oval leaves up to 5 centimeters long and coated in whitish hairs, and the herbage emits a scent generally considered unpleasant.

The seeds are dispersed when the prickles get caught on animal coats and human clothing, and when they are moved by wind.

[4] This plant grows easily in a wide range of habitat types, including agricultural fields, roadsides, gravel beds, and rocky waste places.