What edible wild plants are you likely to find in the Missouri Ozarks around mid April?

I know, weird question. I'm working on a book and this is pertinent to the setting. Basically, I need to know what wild plants a person would likely find in an edible form around early or mid April, and how likely a person would be to come across them if they knew what they were looking for. These would be plants native to a forest area, specifically the Mark Twain National Forests. Acorns and other plants that require special prepairation are out - the plants must be able to be eaten raw. Also, any information on specific plants, their prefered environments, etc; would be welcome. Thanks for any info in advance, and God bless!