Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Conium maculatum L.
- Flowering: April-July
- Field Marks: This species is distinguished by its tall stature up to 10 feet tall, its umbels of white flowers, its purple-spotted stems, and its much-divided leaflets less than 1/2 inch wide.
- Habitat: Wet disturbed areas, particularly in roadside ditches.
- Habit: Robust biennial herb with a taproot.
- Stems: Upright, stout, branched, up to 10 feet tall, purple-spotted, smooth.
- Leaves: Alternate, 3- to 4-pinnately compound, up to 18 inches long, finely divided into leaflets up to 1/2 inch wide, each leaflet deeply toothed or lobed, smooth.
- Flowers: Borne in umbels, with many umbels per plant, each umber up to 3 inches across, subtended by small lanceolate bracts.
- Sepals: 0.
- Petals: 5, free from each other, white.
- Stamens: 5.
- Pistils: Ovary inferior, smooth.
- Fruits: Ovoid, compressed laterally, up to 1/8 inch long, smooth, with pale brown ribs.
- Notes: All parts of this plant are extremely poisonous when eaten. It is native to Europe and Asia.
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