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Apiaceae
Sium

not marked as a favorite taxon Sium suave Walter. Common name: Water-parsnip. Phenology: Jun-Aug; Aug-Oct. Habitat: Freshwater marshes, brackish marshes, swamp forests, in tidally or seasonally flooded hydrology. Distribution: NL (Newfoundland) west to AK, south to Panhandle FL, n. peninsular FL, and CA; e. Russia, China, Korea, and Japan.

Glossary (beta!)

ID notes: The plant can be very coarse, up to 3 m in height and the stem to 5 cm in diameter. Submersed leaves are deeply dissected.

Origin/Endemic status: Native

Taxonomy Comments: The taxonomic status of Sium floridanum Small, known from se. VA south to GA, needs additional investigation; it is probably just a depauperate shade form.

Synonymy ⓘ: = Ar, C, Can, Fl7, FNA13, GrPl, Il, K4, Mi, Mo2, NcTx, NE, NY, Pa, RAB, Tat, Tn, Tx, Va, W, WH3, WV; = Sium cicutaefolium Schrank — S; > Sium carsonii Durieu ex A.Gray; > Sium cicutaefolium Schrank — S13; > Sium floridanum Small — F, G, GW2, MC, S; > Sium suave Walter — F, G, GW2, MC; Sium suave Walter. Basionym: Sium suave Walter 1788

Links to other floras: = Sium suave - FNA13

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: OBL (taxonomic lump from wetland indicator species)
  • Eastern Mountains and Piedmont: OBL (taxonomic lump from wetland indicator species)
  • Great Plains: OBL
  • Midwest: OBL
  • Northcentral & Northeast: OBL (taxonomic lump from wetland indicator species)

Heliophily ⓘ: 7

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image #1 of Sium suave© Gary P. Fleming | Original Image ⭷
image #2 of Sium suave© Jo Roberts, some rights reserved (CC BY), uploaded by Jo Roberts source CC-BY | Original Image ⭷
image #3 of Sium suave© Jo Roberts, some rights reserved (CC BY), uploaded by Jo Roberts source CC-BY | Original Image ⭷
image #4 of Sium suave© Eric M Powell, some rights reserved (CC BY-NC), uploaded by Eric M Powell source CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #5 of Sium suave© Gabriel Campbell, some rights reserved (CC BY), uploaded by Gabriel Campbell source CC-BY | Original Image ⭷
image #6 of Sium suave© Gabriel Campbell, some rights reserved (CC BY), uploaded by Gabriel Campbell source CC-BY | Original Image ⭷
image #7 of Sium suave© Gabriel Campbell, some rights reserved (CC BY), uploaded by Gabriel Campbell source CC-BY | Original Image ⭷
image #8 of Sium suave© Erik Danielson source
image #9 of Sium suave© Gary P. Fleming | Original Image ⭷
image #10 of Sium suave© Gabriel Campbell, some rights reserved (CC BY), uploaded by Gabriel Campbell source CC-BY | Original Image ⭷
image #11 of Sium suave© Gabriel Campbell, some rights reserved (CC BY), uploaded by Gabriel Campbell source CC-BY | Original Image ⭷
image #12 of Sium suave© Nancy L. Martin | Original Image ⭷
image #13 of Sium suave© Eric M Powell, some rights reserved (CC BY-NC), uploaded by Eric M Powell source CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #14 of Sium suave© Gabriel Campbell, some rights reserved (CC BY), uploaded by Gabriel Campbell source CC-BY | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect perennial that can be aquatic, found in freshwater marshes, brackish marshes and swamp forests.

Stems: Stems stout, hollow, longitudinally ribbed, branching above middle, smooth.

Leaves: Leaves alternate, pinnately divided into 5-17 lance-shaped, sharply toothed leaflets that are 1/2-6 in. long; submerged leaves, when present, are 2-3 times divided. Leaf surface smooth.

Inforescence:

Flowers: Flowers in generally flat, compound umbels (2-5 in. wide) at ends of branches, the umbellets with 20-35 flowers each; white; 1/8-1/4 in. wide; consisting of 5 petals with incurved tips, a short calyx, 5 protruding stamens and a 2-celled ovary with a pair of divergent styles.

Fruits: Fruit a joined pair of oval, ridged seeds.

Comments:

Height: 2-6 ft.

plant sale text:

bloom table text:

description: Erect perennial that can be aquatic, found in freshwater marshes, brackish marshes and swamp forests.

stems: Stems stout, hollow, longitudinally ribbed, branching above middle, smooth.

leaves: Leaves alternate, pinnately divided into 5-17 lance-shaped, sharply toothed leaflets that are 1/2-6 in. long; submerged leaves, when present, are 2-3 times divided. Leaf surface smooth.

inflorescence:

flowers: Flowers in generally flat, compound umbels (2-5 in. wide) at ends of branches, the umbellets with 20-35 flowers each; white; 1/8-1/4 in. wide; consisting of 5 petals with incurved tips, a short calyx, 5 protruding stamens and a 2-celled ovary with a pair of divergent styles.

fruits: Fruit a joined pair of oval, ridged seeds.

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