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Montana Field Guide

Montana Field Guides

Watson's Goosefoot - Chenopodium watsonii

Undetermined Origin

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
Stems erect or ascending to decumbent, branched from base, 1-4.5 dm, sparsely to densely farinose. Petiole 0.4-1.4 cm; blade broadly rounded-triangular to rounded-rhombic or ovate, 1-2.6 × 0.5-2.9 cm, base rounded or subtruncate or broadly cuneate, margins entire or proximal leaves with 1-2 teeth on each side at base, apex rounded to obtuse or acute or apiculate, densely farinose on both surfaces. Inflorescences glomerules in paniculate spikes, 14-24 × 2-3 cm, maturing irregularly; bracts leaflike. Flowers: perianth segments 5, connate into 0.3 mm tube; lobes ovate, keeled, 1-1.4 × 0.9-1.2 mm, apex acute to obtuse, farinose, enclosing fruit at maturity; stamens 5; stigmas 2. Achenes ovoid; pericarp adherent, usually strongly whitened, honeycombed. Seeds subglobose, 0.9-1.3 mm diam., margins obtuse; seed coat whitened, coarsely honeycombed (Welsh, 2003, Fl. North America, Vo. 4).

Species Range

Range Comments
AB, MT and SD, south through MT and the Rockies and southwest (Kartesz 2009). In Montana reportedly from Madison, Gallatin, and Park counties.

Observations in Montana Natural Heritage Program Database
Number of Observations: 4

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Relative Density



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

Dry prairies and plains or distributed sites at higher elevations in mountains (Great Plains Flora, 1986).

  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • 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.
    • Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.
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Citation for data on this website:
Watson's Goosefoot — Chenopodium watsonii.  Montana Field Guide.  .  Retrieved on , from