I have double flowered red hibiscus, just beginning to root. Please let me know what type of 'buttercup' you have. please email me image. I want the one i remember from my childhood. You should really view my exchange page too :) thanks, Nicci :) Here is link to different buttercups to help: http://garden.lovetoknow.com/wiki/Crowfoot_Buttercup

From this distance it could be an Oenothera. But we do need a closer picture to be sure.

I am truly lazy when it comes to flower seeds. In fact this is the first year in a long time that I have bothered to start seeds indoors and the only reason I have is because of how long this cold has lasted. What I usually do is take handfuls of seeds that I collected the previous year and just throw them into the area of the garden that I want them to grow. If they come up great if not then it wasn't meant to be. I don't pull back the mulch or anything. I'm so lazy that I should be ashamed of myself. LOL Strangely enough I have had some success with this method. The seeds that almost always sprout are common orange cosmos (for some reason the pink has more trouble), yellow buttercup, butterfly weed (I have more problems getting this to stop sprouting!), rain lily, crossandra, gloriosa lily, phillipine violet, and profusion zinnia. Of course, most of the plants I just listed are more then willing to reseed themselves without any help from me.

You are right, floral, it does not match R. arvensis. The only thing that I can find is R. flabellaris growing underwater, like Hoverfly said. When they grow on land, the foliage becomes much less fine. Is it by any chance growing in an area that has been under water, or is it near water? This really bugs me. Want to know.