Hi! I was wondering if anyone could identify this flower for me; I desperately need to know the name so I can conduct research for an upcoming biology lab. Here's the description: - Very thin purple leaves, yellow middle - diameter ranges from about 1 to 4cm - Thrived among weeds & other wild flowers - Found on trail leading to local park (not in a garden) - Many flowers found to branch off of one large stem, which was relatively thick) - No thorns - Some are quite tall; a little less than a metre - Note: the white flowers to the right and large, weed-like leaves at the bottom of the picture are not part of the plant Any help is greatly appreciated. Thank you in advance! ( photo / image / picture from Amy17's Garden )