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Montana Field Guide

Montana Field Guides

Rocky Mountain Fescue - Festuca saximontana

Status Under Review

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:

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General Description
Cespitose (often densely so) perennials. Culms mostly 8-60 cm tall, sometimes sparsely scabrous or hairy below inflorescence. Leaf sheaths closed about halfway; collars glabrous; ligules 0.1-0.5 mm; blades conduplicate, 0.5-1.2 mm in diameter, upper surface scabrous to puberulent, lower surface glabrous to sparsely puberulent. Inflorescence mostly 3-10 cm long, contracted; branches 1-2 per node, usually erect but spreading at anthesis, lower branches with 2 or more spikelets. Glumes shorter than uppermost florets, scabrous distally; lower glumes 1.5-3.5 mm long; upper glumes 2.5-4.8 mm long; lemmas (3-)3.4-4(-5.6) mm long, often scabrous distally, awns (0.4-)1-2.5 mm long; paleas equal to or slightly shorter than lemmas, hairy distally between nerves; antehrs mostly 1.2-2 mm long; ovary apex glabrous (adapted from: Darbyshire & Pavlick, 2007, in Flora N. America, Vol. 24).

Lavin (2012) treats this species in synonymy of Festuca idahoensis. Taxonomic boundaries differ widely among authors, but Kartesz (in prep. 2012) recognizes only subsp. saximontana for MT.

Range Comments
Widespread across much of North America but mostly absent from TX to MO, IL, and east to PA and FL (Kartesz in prep. 2012).

Probably mostly montane to alpine habitats in Montana (Darbyshire & Pavlick, 2007, in Flora N. America, Vol. 24).

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Citation for data on this website:
Rocky Mountain Fescue — Festuca saximontana.  Montana Field Guide.  .  Retrieved on , from