Juncus alpinoarticulatus Chaix
Common Name: RUSH
Synonym: Juncus alpinus
Coefficient of Conservatism: 5
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

J. alpinus of Michigan Flora.

Moist ground, especially wet sandy and gravelly (often calcareous) shores.

This species and J. articulatus are often difficult to distinguish on the basis of any single character, some exceptions occurring to each item in the key. For example, certain collections from near Laurium (Houghton Co.) have shorter, rounder petals than usual for J. articulatus, but are referred to that species by the spreading inflorescence and the shape of the capsule. (The capsule of J. articulatus tends to taper throughout the terminal half, while that of J. alpinoarticulatus tapers more rapidly nearer the end.) Some other plants have more acute sepals than usual for J. alpinoarticulatus, but are referred to that species by the strongly ascending inflorescence and the petals, which are distinctly shorter than the sepals. More or less sterile intermediates are suspected of being hybrids.

Locations

Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Arenac County
    Only on Charity Island
Baraga County
Bay County
Benzie County
Berrien County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Crawford County
Delta County
Dickinson County
Emmet County
Gogebic County
Grand Traverse County
Houghton County
Huron County
Ingham County
Iosco County
Jackson County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Marquette County
Mason County
Mecosta County
Menominee County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ontonagon County
Ottawa County
Presque Isle County
Roscommon County
Sanilac County
Schoolcraft County
St. Clair County
Tuscola County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 18, 2017. http://www.michiganflora.net/species.aspx?id=1498.