Rungia

Rungia klossii (Mushroom Herb) is easy to grow and propagate. It is easy to root from cuttings. The plant can be eaten raw or cooked. ...Read MoreThe taste really remind you mushroom, hence the common name. Edible and its glossy green leaves is ornamental as well.

I have only just purchased this plant, so can't say how well it grows. More information about it can be found here:)
...Read More://www.herbcottage.com.au/mushroom-plant.html" target="_dgnew"rel="nofollow">http://www.herbcottage.com.au/mushroom-plant.html
I am not sure if it is available in the US?
regards,
W:)