unidentified plant, Isle of Wight

unidentified plant, Isle of Wight

Observation - unidentified plant, Isle of Wight. Description: This plant was growing in cliff-top grassland and along roadsides near the Old Battery above the Needles, Isle of Wight. I'm not sure where to start with identifying it, I can't even make a guess as to family - any help appreciated!

This plant was growing in cliff-top grassland and along roadsides near the Old Battery above the Needles, Isle of Wight. I'm not sure where to start with identifying it, I can't even make a guess as to family - any help appreciated!