Home Caprifoliaceae Triosteum

Triosteum aurantiacum E. P. Bicknell

Common Name: HORSE-GENTIAN
Coefficient of Conservatism: 5
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Forb

In diverse habitats, from swamps and rich deciduous forests to dry sandy or rocky forests with oak, aspen, sassafras, and/or pines, often at the edges.

Some authors treat this species as T. perfoliatum var. aurantiacum (E. P. Bicknell) Wiegand. A few specimens have styles clearly exserted (as much as 2 mm), but the leaf bases and stem pubescence are like those of T. aurantiacum. Pubescence characters are not as consistent as some keys suggest, but if many of the stem hairs are long and eglandular or if the pubescence is sparse, a specimen is pretty surely T. aurantiacum. If the hairs are dense, all or almost all short and mostly glandular, it is probably T. perfoliatum. Stems with short rather dense glandular hairs and a goodly number of longer hairs apparently occur in both species, especially on the distal internodes.

R. Schipper

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Counties
Alger
Allegan
Alpena
Antrim
Arenac
Baraga
Barry
Bay
Benzie
Berrien
Calhoun
Charlevoix
Cheboygan
Chippewa
Clare
Clinton
Delta
Eaton
Gogebic
Grand Traverse
Gratiot
Hillsdale
Ingham
Ionia
Isabella
Jackson
Kalamazoo
Kent
Lake
Lapeer
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Lenawee
Livingston
Mackinac
Macomb
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Midland
Missaukee
Monroe
Montcalm
Muskegon
Newaygo
Oakland
Ontonagon
Osceola
Oscoda
Ottawa
St. Clair
Van Buren
Washtenaw
Wayne
Wexford

Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January, 23, 2025
https://lsa-miflora-p.lsait.lsa.umich.edu/#/record/734