Guess what time it is? It's time for the DG County Fair! Now in it's sixth year, enter your blue-ribbon photos or mouth-watering recipes for a chance to win a gift subscription! Click here here to get all the details, dates and entry rules.
The apparent absence of bracts (leaves) immediately under the umbel (flower cluster) suggest that it is not poison hemlock (Conium maculatum), but some closer photos would help, as well as some photos taken when it is in the growing season to show the leaves, stems, etc.. It's not yarrow either. Your plant is an umbellifer.