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Montana Field Guide

Montana Field Guides

Smooth Crabgrass - Digitaria ischaemum
Other Names:  Small Crabgrass

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Stems 18–45 cm, mostly decumbent, nodes hairless. Leaves: blades 3–5 mm wide; ligules 1–2 mm long, membranous, throat hairy. Inflorescence of 2 to 7 digitately or almost digitately arranged secund spikes, 3–9 cm long. Spikelets 1.5–2 mm long, ovate; first glume very short, about 0.2 mm long, the second glume 1.5–2 mm long, with glandular hairs. Lemmas: fertile lemma ovate, dark brown at maturity (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced throughout nearly all of North America except at the extreme northern latitudes (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 24

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Relative Density



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



  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Brey, C.W. 1998. Epidemiology of wheat curl mite (Aceria tosichella K.) and wheat streak mosaic virus on feral grass species and effect of glyphosate on wheat curl mite dispersal. Ph.D. Dissertation. Bozeman, MT: Montana State University. 136 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Smooth Crabgrass — Digitaria ischaemum.  Montana Field Guide.  .  Retrieved on , from