Poison Ivy Or Maple Seedling . There are more than 30 species of poison ivy. Young leaves on a poison ivy vine. identification Which of these, if any, are poison ivy? Gardening from gardening.stackexchange.com There are more than 30 species of poison ivy. Symptoms of poison ivy rash develop anywhere from 1 to 7 days after exposure, depending on how much urushiol is present, the skin's thickness, and how sensitive the person is. I'm sure i pulled a few of the pi seedlings too, but it would be.