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Can someone tell me what this is? I've got a TON of this on a new property I just moved to.

Located in Dayton, Ohio, USA

What is this?

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    For identification questions, the location in the world of your new property is useful for improving accuracy. Don't need enough accuracy to send you a letter, but Ireland, Manitoba, Panama and Tasmania all have rather different flora, for example. – Ecnerwal May 12 '15 at 3:22
  • Reminds me as being a relative of Hemlock, be careful with it till you identify it as members of this family can be very poisonous. – Fiasco Labs May 12 '15 at 4:14
  • I'd also say some Apioideae. Not blooming yet, I think? But pictures would come in handy if available... Size judging by the dandelion stalk and the leaves on the right probably three feet / scant 1m? And I assume you are in Europe? – Stephie May 12 '15 at 6:08
  • Ohio, US, actually, and 3-4 feet. – himynameismarvin May 12 '15 at 6:33
  • Well Hemlock grows in the US, too. Do you see any ridges on the stalk or is it smooth? Is the surface "dusty" like ripe plums are sometimes? Hollow stalk? If you do cut, be careful, there's a good chance that it is hemlock, the red splotches would say so. – Stephie May 12 '15 at 6:39
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Definitely in the Apiaceae Family. I considered Anthriscus sylvestris (called cow parsley or Queen Anne's Lace) at first, but looking at it a bit more, I'm pretty sure it's Conium maculatum (Hemlock). Fortunately I found a website discussing the differences between the two. From what I can see in your pictures the stems appear rounded rather than grooved, suggesting Hemlock. Also the red dots on the stem are suggestive of Hemlock.

I would suggest clearing it out CAREFULLY before it flowers. Wear gloves and a long sleeved shirt so the sap doesn't get on your skin, if it does wash it off fast. The sap has the potential to cause localized burning/rash on your skin, but it's only lethal if you eat it.

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    CERTAINLY NOT Anthriscus sylvestris - I have seen my fair share of these. Neither size nor stem are right. Ifthis were in Europe, Aethusa cynapium might be a candidate which is quite similar to hemlock, but that's typically not found in the US. Both poisonous, though. – Stephie May 12 '15 at 10:44
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The University of Missouri identifies it as poison hemlock (Conium maculatum L.). Look here - - http://ipm.missouri.edu/IPCM/2012/2/Weed-of-the-Month-Poison-Hemlock/

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    Can you expand on this as link only answers do not provide enough context if the link changes. Why do you think it is hemlock? – kevinsky May 10 '16 at 0:45

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