Poison Hemlock: leaves are glossy green and fern-like; stems with purple spots and white flowers.

• A. Showy Milkweed
• B. Common Mullein
• C. Poison Hemlock
• D. St. John's Wort

Answer: (C)

Recognizing poisonous plants in the field comes down to matching key visual traits to species. The description—glossy green, finely divided fern-like leaves; stems with purple spots; and white flowers arranged in umbrella-shaped clusters—fits Poison Hemlock (Conium maculatum) precisely. The fern-like foliage and the characteristic purple-spotted stems are classic for this plant, and the white umbels of small flowers are typical as well.

The other plants don’t share that exact combination. Showy Milkweed has broader leaves and pink-to-purple flower clusters, without the distinctive purple-streaked stems. Common Mullein features fuzzy, oversized leaves and a tall spike of yellow flowers, not fern-like foliage or purple-streaked stems. St. John’s Wort has small leaves and yellow flowers, and again lacks the fern-like foliage and the spotted stems seen in Poison Hemlock.

So the described features align with Poison Hemlock, making it the best match.