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Sium suave (Hemlock waterparsnip) | NPIN

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Sium suave (Hemlock waterparsnip)
Smith, R.W.

Sium suave

Sium suave Walter

Hemlock waterparsnip, Water Parsnip

Apiaceae (Carrot Family)

Synonym(s): Sium cicutifolium, Sium floridanum, Sium suave var. floridanum

USDA Symbol: sisu2

USDA Native Status: L48 (N), AK (N), CAN (N)

Fragrant, sometimes aquatic plant with flat clusters of tiny dull-white flowers and strongly ridged stems.

The roots of this plant can be boiled and eaten as a cooked vegetable, but because of the plants resemblance to the deadly Water Hemlock (Cicuta maculata), they are best left alone.


Plant Characteristics

Duration: Perennial
Habit: Herb

Bloom Information

Bloom Color: White
Bloom Time: Jul , Aug , Sep


USA: AK , AL , AR , AZ , CA , CO , CT , DC , DE , FL , GA , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NV , NY , OH , OR , PA , RI , SC , SD , TN , TX , UT , VA , VT , WA , WI , WV , WY
Canada: NB , NL , NS , ON , PE
Native Distribution: Throughout East, except Arctic; also in much of West.
Native Habitat: Wet meadows and thickets, muddy shores.

Growing Conditions

Soil Moisture: Moist , Wet


Use Other: Some tribes believed that smoke from common water-parsnip seeds could drive away evil spirits trying to steal a hunters luck. (Kershaw)

Water-parsnip is so similar to its highly poisonous relatives (such spotted water-hemlock), it is better left alone. (Kershaw)
Conspicuous Flowers: yes
Fragrant Flowers: yes

Value to Beneficial Insects

Supports Conservation Biological Control

This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.

Recommended Species Lists

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Additional resources

USDA: Find Sium suave in USDA Plants
FNA: Find Sium suave in the Flora of North America (if available)
Google: Search Google for Sium suave


Record Modified: 2012-06-20
Research By: TWC Staff

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