what about the stem and leaves are they similar to anything?
Well it depends, I have heard some of mis-ids that put people in hospital, and think they must be the shallow end of the gene pool. Like mistaking lord and ladies for sorrel, they look superflicolly simerlar, but at some point most sensible people would spit out something that is burning your lips. Someone would have to be pretty dim to think this sorrel has bit a of tingle, lets make arum leaf soup.
Burdock leaves are large and broadly heartshaped and taste earwaxy bitter, they have a downy underside. At certain times of year foxglove, mullein and comfry could look simerlar, but they don't have bitter tasting leaves. Deadly nightshade can have large downy leaves, I don't what this tastes like, but I bet is smells like tomato leaves when crushed, and it is very rare plant in wild.
If in doubt leave it out. Wait until the plant looks more typical in summer and harvest it next year.