Drosera intermedia Hayne
Common Name: SPATULATE-LEAVED SUNDEW
Coefficient of Conservatism: 8
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Drosera intermedia colony A. A. Reznicek colony

Usually in the wettest parts of bogs and on sandy shores subject to periodic inundation. Preferring acidic soils, it is almost never found with D. linearis, but all four taxa were found in 1984 within 1 meter of each other in a “string bog” in north-central Luce Co.

Although in general this is a less robust species than D. anglica, with shorter scapes, measurements overlap a bit. The petioles tend to be a little longer, usually 2.5–3.5 times as long as the blades, whereas in D. anglica they are usually 1–3 times as long as the blades. On unusually healthy plants, an occasional blade may be as broad as 5 mm. In water or very wet sphagnum, the internodes often elongate, so the plant bears alternate leaves at least below a rosette. Such stem elongation apparently occurs only very rarely in D. anglica. Occasional specimens with pubescent petioles and spatulate leaf blades wider than in D. intermedia may be hybrids with D. rotundifolia (D. ×beleziana Camus).

Locations

Alger County
Allegan County
Baraga County
Barry County
Berrien County
Calhoun County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Clare County
Crawford County
Gladwin County
Gratiot County
Houghton County
Iron County
Kalamazoo County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Livingston County
Luce County
Mackinac County
Manistee County
Marquette County
Mason County
Mecosta County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Ontonagon County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Saginaw County
Schoolcraft County
St. Joseph County
Van Buren County
Washtenaw County
Wexford County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 10, 2017. http://michiganflora.net/species.aspx?id=1176.