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Montana Field Guide

Montana Field Guides

Stout Wood Reed-grass - Cinna arundinacea

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Not Documented

Global Rank: G5
State Rank: SNA
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Cinna arundinacea is not documented in Montana (MTNHP Status Review in 2016). Cinna arundinacea was reported for Sheridan County, Montana in the Atlas of the Flora of the Great Plains (McGregor et al. [eds.] 1977). A search for the specimen(s) was conducted at all herbaria consulted in the preparation of the Atlas (Andrea Pipp personal communication). The specimen (Stephens 67806, KANU) upon which the report was based was later re-determined by R.L. McGregor as Calamagrostis canadensis. A conservation status rank is not applicable (SNA) because this plant is not known to occur in Montana.
General Description
PLANTS: Perennial, short rhizomatous or not. Stems 80–170 cm, slender and hollow, upright with lower section slightly decumbent, and frequently bulbous at the base; nodes 5-13. Sources: McGregor et al. [eds.] 1986; Brandenburg in Flora of North America [FNA] 2007; Lesica et al. 2012.

LEAVES: Blades relaxed, flat, smooth to rough-feeling, up to 34.5 cm in length, 6–15 mm in width; sheaths smooth; ligules pronounced, appearing unevenly torn (lacerate) and fine, 3–9 mm in length. Sources: McGregor et al. [eds.] 1986; Brandenburg in FNA 2007; Lesica et al. 2012.

INFLORESCENCE: A contracted panicle 15–45 cm in length, the branches ascending and part of the panicle’s base frequently encompassed in the topmost leaf’s sheath; spikelets 3.5–7.5 mm in length, one-flowered, jointed below the glumes; glumes keeled, lance-shaped, occasionally bristle-tipped, the first glume with one vein and 3.2-4.2 mm in length, the second glume with three veins and 3.8-5.4 mm in length, exceeding the first glume. Sources: McGregor et al. [eds.] 1986; Brandenburg in FNA 2007; Lesica et al. 2012.

Flowers July-September (McGregor et al. [eds.] 1986).

Diagnostic Characteristics
Cinna arundinacea - Not Documented in Montana
*Inflorescence: ascending to erect branches.
*Spikelets: Larger, about 4.5-6 mm in length.
*Upper Glumes: 3-veined.

Cinna latifolia - Drooping Woodreed, native
*Inflorescence branches more relaxed to drooping
*Spikelets: Smaller, about 2.5-4 mm in length
*Glumes: 1(3)-veined

Range Comments
Found in the mid-west and south-central U.S. and eastward (Brandenburg in FNA 2007).

  • Literature Cited AboveLegend:   View Online Publication
    • Flora of North America Editorial Committee. 2007. Flora of North America North of Mexico. Vol. 24. Magnoliophyta: Commelinidae (in part): Poaceae, part 1. Oxford Univ. Press, New York. xxviii + 911 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • McGregor, R. L., et al. 1977. Atlas of the flora of the Great Plains. Great Plains Flora Associations, Iowa State University Press, Ames, Iowa. 600 pp.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Stout Wood Reed-grass — Cinna arundinacea.  Montana Field Guide.  .  Retrieved on , from