What is poison ivy?

What is poison ivy?

• A. A herbaceous broadleaf plant.
• B. Triangular with solid stems.
• C. Deciduous woody vine; causes skin irritation.
• D. A primitive perennial that reproduces by creeping roots and tubers.

Answer: (C)

Poison ivy is a plant that poses a skin-contact hazard. It is a deciduous woody vine that climbs or sprawls, losing its leaves in winter, rather than being a herbaceous plant. The real danger comes from a resin called urushiol present in all parts of the plant—leaves, stems, roots, and berries—which can trigger an itchy, blistering rash in many people after contact. That combination—being a deciduous woody vine and causing skin irritation—best fits what poison ivy is. For field identification, you’ll often see three leaflets on a leaf and a climbing habit, but the key safety takeaway is to avoid contact and wash exposed skin and clothing promptly if exposure occurs.

Poison ivy is a plant that poses a skin-contact hazard. It is a deciduous woody vine that climbs or sprawls, losing its leaves in winter, rather than being a herbaceous plant. The real danger comes from a resin called urushiol present in all parts of the plant—leaves, stems, roots, and berries—which can trigger an itchy, blistering rash in many people after contact. That combination—being a deciduous woody vine and causing skin irritation—best fits what poison ivy is. For field identification, you’ll often see three leaflets on a leaf and a climbing habit, but the key safety takeaway is to avoid contact and wash exposed skin and clothing promptly if exposure occurs.