Panarctic Flora


341204 Trisetum molle (Michx.) Kunth


Northern Iceland: Scattered
Taimyr - Severnaya Zemlya: Rare
Anabar - Onenyo: Rare
Kharaulakh: Rare
Yana - Kolyma: Rare
West Chukotka: Scattered
South Chukotka: Scattered
East Chukotka: Scattered
Western Alaska: Scattered
Northern Alaska - Yukon: Scattered
Central Canada: Rare
Hudson Bay - Labrador: Rare
Western Greenland: Frequent
Eastern Greenland: Scattered
Mid Arctic Tundra: Presence uncertain
Southern Arcti Tundra: Scattered
Shrub Tundra: Frequent
Bordering boreal or alpine areas: Frequent


2n= 42 (6x). - Europe (Iceland), Siberia, Canada, U.S.A., Greenland. - Numerous reports, for "spicatum", "pilosiglume", "triflorum", and "molle".
The question whether there are two ploidy levels in this subspecies remains open. Sokolovskaya and Probatova (1975) reported 2n = 28 for both "molle" and "alaskanum" from the Russian Far East.

Geography: Asian (NE) - amphi-Beringian - North American - amphi-Atlantic (W): SIB RFE ALA CAN GRL ICE.

Notes: Löve and Löve (1965) stated the name Trisetum triflorum to have priority for a species as T. molle is a later homonym. The basionym of T. molle, Avena mollis Michx., is an invalid homonym within Avena but this does not invalidate the name T. molle within Trisetum.

Subspecies pilosiglume is reported to be hexaploid and was the only additional race of T. spicatum (s. lat.) accepted by Soreng et al. (2003). It seems to be an Atlantic part of the more widespread T. molle. Böcher et al. (1978) accepted two taxa for Greenland but the differences reported are almost only in hairs of the glumes.

Variety maidenii is probably not a relevant name for us. Hultén (1942) synonymized var. maidenii with T. alaskanum Nash. Aiken concluded that var. maidenii should not be recognized as a taxon. Elven commented that this is probably true, at least in the Northern Hemisphere. Trisetum subspicatum f. maidenii Gand., Bull. Soc. Bot. France 42: 182 (1902), was described from Australia: New South Wales, leg. Maiden, and may have a reality as a taxon at some level in the Southern Hemisphere but probably not in the north.

For a last name, var. majus, consult Rydberg (1906).

Higher Taxa