Sium suave, the water parsnip or hemlock waterparsnip, is a perennial wildflower in the family Apiaceae.

Sium suave, also widely known as water parsnip, is a wildflower native to parts of the northern hemisphere[3] and thriving in primarily wetland habitats.

[5] Water parsnip blooms from July to August[6] and creates many small white flowers with umbel inflorescences.

[6] There is a vast number of insect species of bees, beetles, wasps, butterflies, and flies that visit this plant for its nectar and pollen.

[5] Some common characteristics of this genus include serrate leaves with teeth turned inward and slightly overlapping, flowers in bracteate umbels with conspicuous involucels, five small teeth on calyx, white petals that are obcordate with inflexed apex, styles with depressed conical base which spread or recurve above, fruit that are laterally flattened with mericarp exhibiting 5 ridges, and subterete seeds.

"), the hemlock waterparsnip or water parsnip, is a herb native to parts of Canada, Asia, and North America.

These wetland habits include wet prairies, bottoms of seeps, low areas along springs, soggy thickets, swamps, borders and shallow water of ponds, marshes, and ditches.

[4] It is native to both North America and Asia in Canada, the United States, Japan, Russian Federation, South Korea, and China.

[3] Extreme caution should be practiced when using this plant for food because it resembles the very poisonous Cicuta maculata (Spotted Water Hemlock).

[a] Edible parts of Sium suave include the root in the spring and fall, either raw or cooked; it has a nutty flavor.

Crushed water parsnip roots have also been used as an analgesic (pain reliever) in cases of broken limbs.

Type I physoderm causes conspicuous black pustules on several parts of the plant including the stem, petiole, leaflet lemina, and flowers.