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Montana Field Guide

Montana Field Guides

Thurber's Bentgrass - Agrostis thurberiana
Other Names:  Podagrostis thurberiana

Status Under Review

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Perennials, sometimes rhizomatous, to 50 cm, bases sometimes somewhat decumbent. Ligules mostly 0.5-2 mm, truncate to obtuse and usually erose to lacerate apically, scabridulous; blades 2-15 cm long, 1-4 mm wide, flat to involute. Paincles 1.5-14 cm long, 0.4-2.5 cm wide, somewhat lax, lowest nodes with 1-5 branches; branches smooth or scabridulous, ascending to erect, and rebranching in the upper 1/3-3/4. Spikelets 1.5-2.5 mm long, rachilla occasionally extended beyond palea. Glumes subequal, 1.6-2.3 mm long, 1-nerved, lanceolate, usually purple. Lemmas 1.5-2.5 mm long, 5-veined, relatively thick, rarely awned at middle or subapically with awns to about 1.3 mm long; paleas 0.9-1.6 mm; anthers 3, 0.4-0.8 mm long. Caryposes 1-1.3 mm long (adapted from: Harvey, 2007, in Flora N. America, Vol. 24; Shaw, 2008, in Grasses of Colorado).

Many now treat this species under the name Podagrostis humilis (Vasey) Bjorkman (e.g., Kartesz et al. 2012; Shaw 2008 [Grasses of Colorado]).

Diagnostic Characteristics
Sometimes included within Agrostis humilis.

Species Range

Range Comments
AK to AB south to CA, AZ and CO (Kartesz in prep. 2012).

Summary of Observations Submitted for Montana
Number of Observations: 6

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Alpine or subalpine scree and meadows, fens and open grasslands (Harvey, 2007, in Flora N. America, Vol. 24).

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Citation for data on this website:
Thurber's Bentgrass — Agrostis thurberiana.  Montana Field Guide.  .  Retrieved on , from