Cheerful or toxic?

February can be such a gloomy month. I went out looking in vain for signs of spring and only found a few weak little snowdrops in a Saltaire garden - so puny they weren't even worth a photo! I snapped this glorious burst of ragwort late last summer, on my walk to work. It's a reminder that nature pulses through, even in the most inhospitable surroundings. Such a cheerful little plant. Not being a great botanist, I'm not sure which type of ragwort this is. One type, Oxford Ragwort - senecio squalidus - is native to Sicily but the wind-blown seeds reputedly escaped from specimen plants growing in Oxford Botanic Gardens and spread all over Britain, along the railway network. The native type, Common Ragwort - senecio jacobaea - is toxic to livestock, causing liver damage and it is considered a pernicious weed. Which is a pity, when it's so innocently pretty.