May - August
0.5 - 3.0
Veins in leaflets terminate at the notch between teeth, prominent calyx teeth visible on the flower and fruit; roots are a bundle of yellowish finger sized tubers. Similar to Conium maculatum that has no calyx teeth on flowers, veins that end in the point of the teeth on the leaflets, and a white tap root.
Roadsides, fencerows, stream banks, waste places, thickets.