Festuca rubra subsp. fallax

(Thuill.) Nyman
Common names: Flatleaf red fescue Fétuque trompeuse
Synonyms: Festuca rubra var. multiflora Festuca rubra subsp. multiflora Festuca rubra var. fraterculae Festuca heteromalla Festuca diffusa
Treatment appears in FNA Volume 24. Treatment on page 415.
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Illustrator: Cindy Roché

Copyright: Utah State University

Plants cespitose, strongly rhizomatous, stoloniferous, sometimes with solitary culms. Culms 50-90(130) cm. Sheaths of innovations red-brown at the base, scarious, pubescent on the upper parts, shredding into fibers; blades usually flat and 2-7 mm wide, or loosely conduplicate and 0.8-2.5 mm in diameter; abaxial sclerenchyma in 5-9 broad strands; adaxial sclerenchyma always present. Inflorescences 9-15 cm, open, lax or erect. Spikelets 8-14(17) mm, with (4)6-10 florets. Glumes ovate-lanceolate to lanceolate, acute to acuminate; lower glumes 3.5-4.5(7) mm; upper glumes 5-6.5(8.5) mm; lemmas 5-7.5(9.5) mm, green or glaucous, often red-violet along the margins, glabrous, smooth, awned, awns 0.8-3.2 mm; anthers 3.5-4.5 mm. 2n = 42, 56, 70.

Discussion

Festuca rubra subsp. fallax is a robust taxon that grows in damp, often disturbed places. It is native to northern and central Europe, but has been introduced widely in the Flora region, occurring from British Columbia to eastern Quebec and south to California. It is now common in some areas, occasional in others.

Festuca rubra var. fraterculae Rasm., an unusual form described from the nesting colonies of Atlantic puffins (Fratercula arctica) on the Faeroe Islands and reported as introduced to southern Greenland, is included here in F. rubra subsp. fallax. Its luxuriant growth (flat leaves 4-7 mm wide, long stolons, and rhizomes) appears to be a phenotypic response to the soil conditions created by the puffins.

Selected References

None.

Lower Taxa

None.
Stephen J. Darbyshire +  and Leon E. Pavlickf +
(Thuill.) Nyman +
Flatleaf red fescue +  and Fétuque trompeuse +
Conn. +, N.J. +, N.Y. +, Wash. +, Va. +, Del. +, D.C. +, Wis. +, W.Va. +, Pacific Islands (Hawaii) +, Mass. +, Maine +, N.H. +, R.I. +, Vt. +, Oreg. +, Wyo. +, Ala. +, Ariz. +, Ga. +, Iowa +, Ill. +, Ind. +, Ky. +, Md. +, Mich. +, Minn. +, Mont. +, N.Dak. +, Nebr. +, N.Mex. +, Pa. +, S.C. +, Tex. +, N.C. +, Tenn. +, Calif. +, Nev. +, Alaska +, Colo. +, Idaho +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Ohio +, Utah +  and Mo. +
Festuca rubra var. multiflora +, Festuca rubra subsp. multiflora +, Festuca rubra var. fraterculae +, Festuca heteromalla +  and Festuca diffusa +
Festuca rubra subsp. fallax +
Festuca rubra +
subspecies +