Identification: Wild riparian plant

I found this growing adjacent to a colony of Lizard's Tail in a swampy area adjacent to a stream.

 

Obviously an Aroid, and if you were anywhere further south I'd be tempted to say it was a Xanthosoma. However, you're well into seasonally-dormant-land. Maybe Arum of some sort? A. maculatum is fairly common up there if memory serves.

 

Here's one more of the leaf, it has a little tendril where it comes to a point.

 

For me, that confirms Arum.

 

Thanks for the ID.