Latin name:  Conium maculatum

Family:  Apiaceae

Common name:  poison hemlock

Life cycle:  biennial, spreading by seed
Habit: initially a bushy rosette, then growing upright to 8 feet tall
Foliage:  Foliage is 3 to 4 times pinnately compound.  Leaves are glossy and margins are serrated.  
Flowers:  Flowers are white with 5 petals, and occur in clusters called compound umbels.
Stems:  Stems are smooth, glabrous, round in cross-section, and spotted or streaked purple.  Purple coloration on the stem is a good way to make certain this species' identification.

More photos are posted on my overflow here.

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