Veronica serpyllifolia L.
Common Name: THYME-LEAVED SPEEDWELL
Coefficient of Conservatism: *
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Ad P-Forb

A widespread Eurasian weed, well established in forests (especially along borders, trails, old logging roads, openings, and clearings); meadows, pastures, farmyards, roadsides, and other disturbed ground; fields, lawns, gardens; banks of rivers and streams. Collected as early as 1842 (presumably Macomb or Oakland Co.), 1857 (Detroit, Wayne Co.), 1860 (Ann Arbor, Washtenaw Co.), and 1861 (Mackinac Island, Mackinac Co.); by 1890, locally throughout the state. The introduced plant is the var. serpyllifolia, with usually usually whitish or pale blue flowers (with darker blue lines) and the inflorescence axis and pedicels having only incurved hairs

One old undated but mid-19th century collection from Chippewa Co. is apparently the native boreal and western var. humifusa (Dickson) Vahl, sometimes recognized as a distinct species. This variety has many straight hairs slightly longer than the antrorsely incurved ones, especially in the inflorescence (on the axis and pedicels), giving that part of the plant a more hairy look than the lower portion of the stem; the flowers (deeper blue) and fruits are a little larger than in var. serpyllifolia.

Locations

Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
Delta County
Eaton County
Emmet County
Genesee County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Marquette County
Mason County
Mecosta County
Midland County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oceana County
Ogemaw County
Ontonagon County
Otsego County
Ottawa County
Presque Isle County
Saginaw County
Sanilac County
Schoolcraft County
Shiawassee County
St. Clair County
Tuscola County
Van Buren 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 14, 2017. http://www.michiganflora.net/species.aspx?id=1985.