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Montana Field Guide

Montana Field Guides

Wirestem Muhly - Muhlenbergia mexicana

Status Under Review
Native Species

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:

External Links

General Description
Perennials from long, scaly rhizomes. Stems 30-100 cm tall, ascending to erect, branching from middle and above. Leaf sheaths mostly glabrous; blades lax, flat, 4-15 cm long, 1.5-6 mm wide, scaberulous; ligules 0.4-1.5 mm long, truncate to acute. Panicles 3-21 cm long, 2-12 mm wide, terminal and axillary, narrow, often interrupted and partially included in uppermost sheath; branches mostly erect, spikelet-bearing thorughout. Callus hairs 0.2-1.5 mm long. Spikelets 2-4.4 mm long, one-flowered, pale green or purple-tinged. Glumes subequal, 2-4.4 mm long, 1-nerved, the midnerves extending into an awn 0.5-1.5 mm long; lemmas 2-3.8 mm long, 3-nerved, awned to about 6 mm long; paleas about length of lemma; anthers 0.3-0.5 mm long (adapted from: Welsh et al., 1993, A Utah Flora, 2nd ed.).

Range Comments
BC to NS, south to CA, TX, AR, and VA (Kartesz in prep. 2012). Collected in Carbon County, MT, in 2001 at Bighorn National Recreation Area by Bonnie Heidel (no. 2104) (Rocky Mountain Herbarium website, accessed 3 January 2013).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(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)

Wet areas, sometimes in woodlands, often in disturbed sites.

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Citation for data on this website:
Wirestem Muhly — Muhlenbergia mexicana.  Montana Field Guide.  .  Retrieved on , from