Trisetum spicatum (L.) Richter
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Family: Poaceae
Genus: Trisetum
Species Synonyms: Aira spicata L.
Trisetum montanum Vasey
Trisetum montanum var. shearii Louise-Marie
Trisetum spicatum var. alaskanum (Nash) Malte ex Louise-Marie
Trisetum spicatum ssp. alaskanum (Nash) Hultén
Trisetum spicatum ssp. congdonii (Scribn. & Merr.) Hultén
Trisetum spicatum var. congdonii (Scribn. & Merr.) A.S. Hitchc.
Trisetum spicatum var. maidenii (Gandog.) Fern.
Trisetum spicatum var. majus (Rydb.) Farw.
Trisetum spicatum ssp. majus (Rydb.) Hultén
Trisetum spicatum ssp. molle (Kunth) Hultén
Trisetum spicatum var. molle (Kunth) Hultén
Trisetum spicatum ssp. montanum (Vasey) W. Weber
Trisetum spicatum var. pilosiglume Fern.
Trisetum spicatum ssp. pilosiglume (Fern.) Hultén
Trisetum spicatum var. spicatiforme Hultén
Trisetum spicatum var. villosissimum (Lange) Louis-Marie
Trisetum subspicatum (L.) Beauv.
Trisetum triflorum (Bigelow) A.&D. Löve
Trisetum triflorum ssp. molle (Kunth) A.&D. Löve
Trisetum villosissimum (Lange) Louis-Marie
Common Names: spike trisetum
narrow false-oat
Canada: Yukon – Mackenzie – Arctic Islands – northern Ungava – Labrador, south to British Columbia – northern Alberta – northern Saskatchewan – central Manitoba – southern Ontario (Lake Superior, James Bay) – southern Quebec
Saskatchewan: northern Saskatchewan; Lake Athabasca – Cluff Lake – Hasbala Lake, Cypress Hills
Ecoregion: Cypress Upland, Athabasca Plain, Tazin Lake Upland, Selwyn Lake Upland
Saskatchewan: dry, open, sand or gravel woods and clearings
Provincial Status According
to Harms (2003):
Nature Conservancy Status:
G2 S2
Saskatchewan Species at
Risk Status:
Trisetum spicatum is vulnerable because it is rare or uncommon in Saskatchewan. It is usually locally numerous within limited areas. No threats are known or anticipated for this species at the present time.
Height: 10 – 120 cm
Roots: roots fibrous
Stems: caespitose, erect, usually glabrous
Leaves: mostly basal or evenly distributed on stem, blades 10 – 20 cm long, 1 – 5 mm wide, flat to involute; sheaths pubescent or glabrous; ligules 1 – 4 mm long; auricles absent
Inflorescence: panicle 20 – 30 cm long, 1 – 2.5 cm wide, spicate top open, often interrupted basally, green to purplish to tawny
Spikelets: 5 – 7.5 mm long, 2 – 5-flowered, sessile to short-petiolate; rachilla hairy
Florets: glumes 3 – 7 mm long, subequal to equal, lanceolate, occasionally somewhat scabrous or pilose; callus pubescent; lemmas 3 – 7 mm long, lanceolate, glabrous to pilose, apex two-toothed, awned; awns 3 – 8 mm long, inserted on the back of the lemma, geniculate, twisted basally; palea nearly equal to lemmas, membranous
Fruits: caryopsis glabrous
1 Lemma conspicuously awned, apex two-toothed
T. spicatum
1 Lemma unawned or very short-awned, apex entire
T. wolfii