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Montana Field Guide

Montana Field Guides

Wirestem Muhly - Muhlenbergia mexicana

Status Under Review

Global Rank: G5
State Rank: SU

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:

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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).

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

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