Sium suave Walter
Coefficient of Conservatism: 5
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Marshes, swales, and ditches; swamps, potholes in forests; shores and borders of rivers, ponds, and lakes; often in shallow water (even to 6 dm deep).

The lower leaves if they are (or have been) submersed may be slightly to very extensively dissected, quite unlike the usual leaves, and the submersed stem may be very much inflated. The stem is corrugated, though not so deeply furrowed, as in Pastinaca. The styles are at least 0.5 mm long beyond the stylopodium, and strongly recurved. An occasional plant of Cicuta bulbifera might key here, but the slender leaflets are very deeply toothed, the styles very short, and the stem terete (though striate), apart from the usual presence of bulblets in the inflorescence.


Alger County
Allegan County
Alpena County
Baraga County
Bay County
Benzie County
Berrien County
Calhoun County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
Clare County
Clinton County
Crawford County
Delta County
Eaton County
Emmet County
Gogebic County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Missaukee County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Ogemaw County
Ontonagon County
Ottawa County
Presque Isle County
Roscommon County
Saginaw County
Sanilac County
Schoolcraft County
St. Clair County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 3, 2022.