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Montana Field Guide

Montana Field Guides

Watson's Goosefoot - Chenopodium watsonii


Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:

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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
Unknown/Undetermined
 


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.

Summary of Observations Submitted for Montana
Number of Observations: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

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



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

References
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Citation for data on this website:
Watson's Goosefoot — Chenopodium watsonii.  Montana Field Guide.  .  Retrieved on , from