Montana Field Guide

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- Kingdom - Plants - Plantae
  - Division - Flowering Plants - Anthophyta
    - Class - Monocots - Monocotyledoneae
      - Order - Grasses/Sedges - Cyperales
        
        Family - Grasses - Poaceae
        
        Species - Weak Mannagrass - Torreyochloa pallida

Weak Mannagrass - Torreyochloa pallida

Other Names: Glyceria pauciflora, Puccinellia pauciflora, Puccinellia pallida var. pauciflora

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Native Species

Global Rank: G5
State Rank: S4
C-value: 7

Agency Status
USFWS:
USFS:
BLM:

External Links

General Description

Cool season, rhizomatous, perennial aquatic. Stems 40–70 cm. Leaves: blades 1–3 mm wide, mostly flat and lax to ascending; sheaths with overlapping margins; ligule membranous. Inflorescence an open panicle 6–12 cm long. Spikelets 4–7 mm long, with 4 to 7 florets; glumes similar to lemmas. Lemmas hairless or scabrous with a blunt tip, rounded on back and with prominent parallel venation; palea well developed. Disarticulation above glumes; unit of dispersal the floret (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments

Throughout western North America (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database

Number of Observations: 29

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Relative Density

Recency

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

Habitat

Alkaline and fresh water aquatic, often at higher elevations, primarily in western MT. (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Stewardship Responsibility

References

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Citation for data on this website:
Weak Mannagrass — Torreyochloa pallida. Montana Field Guide. Montana Natural Heritage Program. Retrieved on November 21, 2024, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=PMPOA61030