Gentiana andrewsii Griseb.
Common Name: CLOSED GENTIAN, BOTTLE GENTIAN
Coefficient of Conservatism: 5
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Forb

Marshy or at least moist ground: meadows and wet prairies; shores, thickets, and ditches; river banks, floodplains, swamps. Our commonest species of closed or bottle gentian.

Each corolla lobe terminates in a small tooth or mucro. White-flowered individuals [f. albiflora Britton] occur occasionally with the normal blue ones, and pale blue flowers also occur uncommonly. White- or blue-flowered plants may be easily distinguished from G. saponaria, which also has ciliate calyx lobes, by the broader leaves of G. andrewsii (as broad as in G. alba) as well as the very short tips of the corolla lobes. Hybrids with G. alba [G. ×pallidocyanea J. S. Pringle] have been identified by Pringle from Genesee and Wayne Cos. The hybrid with G. puberulenta [G. ×billingtonii Farw.] was originally described from Squirrel Island on the Ontario side of the St. Clair River, and may turn up in Michigan, as might the rare hybrid with G. rubricaulis [G. ×grandilacustris J. S. Pringle], described from Minnesota.

Locations

Allegan County
Alpena County
Arenac County
Barry County
Bay County
Benzie County
Berrien County
Calhoun County
Cass County
Cheboygan County
Chippewa County
    Only on Drummond Island
Clare County
Clinton County
Delta County
Dickinson County
Emmet County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kent County
Lake County
Lapeer County
Leelanau County
Lenawee County
Livingston County
Macomb County
Manistee County
Mason County
Mecosta County
Menominee County
Midland County
Missaukee County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ontonagon County
Osceola County
Oscoda County
Ottawa County
Presque Isle County
Saginaw County
Sanilac County
Shiawassee County
St. Clair County
St. Joseph 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 12, 2017. http://www.michiganflora.net/species.aspx?id=1392.