I like that this plant is holding it's own against vinca...there is rampant wisteria just on the other side of the gravel road along with jonquils and more vinca.
 Next hike I would like to see how much arum is there...we only noticed the one large patch the other day.
 
 It sounds like it divides from corms and I assume it might go dormant late summer since it sends up new leaves in the fall? 
 I'll wait until then to decide about digging some and in the meantime I should be able to see it flower early summer.
 
 Actually cooking up a root might take more research and thought.  
 I've even gotten lazy about poke...so much water and boiling 
 
 I love it though and used to eat it several times every early spring.
 
 Skandi and Nancy, thank you both for the quick ID and confirmation.