Ragwort

Ragwort is a tall, straggly looking plant with big yellow flower heads that stands out on the limestone pavement, partly because of its brightness and partly just because it's so much bigger than most other flowers. It's not a popular plant as it's poisonous to cattle and horses, and maybe because of this most people consider it an ugly weed. But if you get up close and look at all the small flower heads, it looks more like a field of sunflowers.

Ralph Doyle