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.
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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© Gary P. Fleming | Original Image ⭷
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Horticultural Information
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.
comments:
cultural notes:
germination code:
native range:
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