Cicuta douglasii (DC.) Coult. & Rose

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Cicuta douglasii, the western water hemlock, is a very poisonous perennial plant in the family Apiaceae.

Description

The plant's roots are thick and tuberous, with many smaller tubers on the main one, allowing survival in wet conditions. The stem is 0.5–2 meters (1+1⁄2–6+1⁄2 ft) tall with purplish spots. The inner tubers and stem bases can have horizontal chambers useful for identification. The leaves are alternate and compound pinnate; the secondary veins of the leaflets end at the bases instead of the tips of the teeth. The leaflets are 3–10 centimeters (1+1⁄4–4 in) long and 1–2 cm (1⁄2–3⁄4 in) wide, with jagged edges. Its inflorescences are compound umbels about 12.5 cm (5 in) across,[4] with many small, white flowers, which have two seeds each. The seeds germinate in spring, and flowers mature near the end of June and beginning of July. Seed dispersal is by means of wind, water, machinery, clothing, and through transported soil. In addition to sprouting new plants from seeds, rootstocks can also produce new plants in the fall from the basal meristem. When these detach the following spring, they may form a new plant.

Cicuta douglasii - Wikipedia

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