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Ranunculus sp.
These grow on very tall, slender stems with very little foliage. They come up to about my waist an I'm just over 5 foot, so I'd say they grow right around 2.5-3 feet tall.
Without seeing the leaves it's hard to identify the species. Check out this one I spotted, as it may be the same: http://www.projectnoah.org/spottings/601...