Marsh parsley, also called slender celery, is a delicate little plant up to 20 inches, but often less. It's said to work as a parsley substitute, but apparently not good enough to gain a place of its own at the table. In Ethiopia it's used to treat Mitch. Mitch, despite the initial upper case letter, turns out to be a malady rather than a guy. It's a intestinal illness, mild enough to make one hope marsh parsley will make it better, not bad enough to keep you from eating it. It's been considered for cultivation, but mostly shows up in our fields as a weed. Native to South America, marsh parsley now occurs around the world. It has been reported from AL, AR, AZ, CA, FL, GA, HI, IL, LA, MD, MS, NC, NM, NV, NY, OK, OR, PA, SC, TN, TX, VA, and WV. Polk Co FL, 3/16/16.