Chenopodium watsonii A. Nels.
Family: Amaranthaceae
Watson's goosefoot
[Chenopodium dacoticum Standl.,  more]
Chenopodium watsonii image
Patrick Alexander  
Stems erect or ascending to decumbent, branched from base, 1-4.5 dm, sparsely to densely farinose. Leaves aromatic; 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. 2n = 18. Fruiting late summer-fall. Woods and shrublands of various types, badlands, erosion breaks in prairies, volcanic rocks, pinyon and juniper, sagebrush, disturbed ground, old mine areas, roadsides; 600-3200 m; Alta., Sask.; Ariz., Calif., Colo., Kans., Mont., N.Mex., S.Dak., Utah, Wyo.
FNA 2003, Martin and Hutchins 1980, Kearney and Peebles 1969
Duration: Annual Nativity: Native Lifeform: Forb/Herb General: Much branched annual, stems densely farinose, strongly scented, erect or ascending, 10-45 cm tall. Leaves: Blades 10-40 mm long, nearly as wide as long, broadly rounded-deltoid to rhombic or broadly ovate, rounded or obtuse and short-apiculate at the apex, rounded to truncate or broadly cuneate at the base, entire, sometimes lower bearing 1 or 2 rounded teeth on each side, farinose on both sides, petioles shorter than to as long as blades. Flowers: Glomerules in paniculate spikes, 14-24 cm long by 2-3 cm wide; leaflike bracts; 5 perianth segments, connate into 0.3 mm tube, lobes ovate, enclosing fruit at maturity. Fruits: Achenes ovoid, pericarp adherent, strongly whitened, honeycombed, seeds subglobose, 0.9-1.3 mm diameter. Ecology: Found on dry soils from 1,000-7,000 ft (305-2134 m); flowers May-September. Notes: Distinguished by the entire leaves with only 1-2 teeth near base, with subglobose seeds, pericarp slightly whitened. Ethnobotany: The seeds were eaten. Etymology: Chenopodium means goose foot, while watsonii is named for Sereno Watson (1826-1892) an assistant to Asa Gray at Harvard. Synonyms: Chenopodium dacoticum, Chenopodium glabrescens, Chenopodiumolidum Editor: SBuckley, 2010
Chenopodium watsonii image
Patrick Alexander  
Chenopodium watsonii image
Patrick Alexander  
Chenopodium watsonii image
Patrick Alexander  
Chenopodium watsonii image
Patrick Alexander  
Chenopodium watsonii image
Chenopodium watsonii image
Chenopodium watsonii image
Chenopodium watsonii image
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Chenopodium watsonii image
Chenopodium watsonii image
Chenopodium watsonii image
Chenopodium watsonii image
Chenopodium watsonii image
Chenopodium watsonii image
Chenopodium watsonii image