Small unknown yellow flower

Small unknown yellow flower

Observation - Small unknown yellow flower. Description: Tiny yellow flowers, about 2-3 mm across. Leaves bristly/hairy. Plant itself about 18 inches tall. On wasteground at edge of parkland, along with assortment of other weeds and wildflowers.

Tiny yellow flowers, about 2-3 mm across. Leaves bristly/hairy. Plant itself about 18 inches tall. On wasteground at edge of parkland, along with assortment of other weeds and wildflowers.