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Montana Field Guide

Montana Field Guides

Yellow Bluestem - Bothriochloa ischaemum
Other Names:  King Ranch Bluestem, King Ranch Beardgrass, Andropogon ischaemum

Non-native Species

Global Rank: G5
State Rank: SNA
C-value: 1

Agency Status


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General Description
Bunchgrass. Stems 6–10 dm, leaf sheaths not keeled. Leaves: blades 1–3 mm wide; ligule 0.5–1.5 mm long with a fringe of hairs. Inflorescence with numerous (2 to 8) racemes or spikes, each about 3–7 cm long, terminating the main stem in an apparently digitate arrangement. Spikelets: rachis and pedicels silky hairy along margins; sessile spikelets 3–4.5 mm long, glumes purplish to greenish, acute. Lemmas: fertile lemma with an awn 9–17 mm long; pedicellate spikelet about as large as the sessile spikelet (Lavin in Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Collected in Lake County Introduced in southern U.S (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: 1

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Relative Density



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



  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Web Search Engines for Articles on "Yellow Bluestem"
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Citation for data on this website:
Yellow Bluestem — Bothriochloa ischaemum.  Montana Field Guide.  .  Retrieved on , from