Chenopodium watsonii

A. Nelson

Bot. Gaz. 34: 362. 1902.

IllustratedEndemic
Basionym: Chenopodium olidum S. Watson Proc. Amer. Acad. Arts 9: 95. 1874,
Treatment appears in FNA Volume 4. Treatment on page 293. Mentioned on page 277, 291.

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.


Phenology: Fruiting late summer–fall.
Habitat: Woods and shrublands of various types, badlands, erosion breaks in prairies, volcanic rocks, pinyon and juniper, sagebrush, disturbed ground, old mine areas, roadsides
Elevation: 600-3200 m

Distribution

V4 557-distribution-map.gif

Alta., Sask., Ariz., Calif., Colo., Kans., Mont., N.Mex., S.Dak., Utah, Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

"narrower" is not a number."thick" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Chenopodium watsonii"
dehiscent +  and indehiscent +
Acute (?) +  and Obtuse (?) +
Steven E. Clemants +  and Sergei L. Mosyakin +
A. Nelson +
slippery +
aromatic +
cuneate +, subtruncate +  and rounded +
Chenopodium olidum +
1 cm10 mm <br />0.01 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
broadly rounded-triangular +  and rounded-rhombic or ovate +
0.5cm;2.9cm +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
Alta. +, Sask. +, Ariz. +, Calif. +, Colo. +, Kans. +, Mont. +, N.Mex. +, S.Dak. +, Utah +  and Wyo. +
600-3200 m +
hippocrepiform +  and annular +
symmetric +, or +  and uniseriate +
dehiscent +  and indehiscent +
Woods and shrublands of various types, badlands, erosion breaks in prairies, volcanic rocks, pinyon and juniper, sagebrush, disturbed ground, old mine areas, roadsides +
small white +
inflated +
14 cm140 mm <br />0.14 m <br /> (24 cm240 mm <br />0.24 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
sessile +  and petiolate +
aromatic +
not fleshy +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
keeled +  and ovate +
0.9mm;1.2mm +
not winged +  and winged +
sinuate-dentate +  and dentate +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
honeycombed +
chartaceous +  and membranaceous +
0.4 cm4 mm <br />0.004 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
Fruiting late summer–fall. +
pointing +  and ascending +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
honeycombed +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (?) +  and 0.13 cm1.3 mm <br />0.0013 m <br /> (?) +
subglobose +
Illustrated +  and Endemic +
cylindric +
not imbricate +
keeled +  and rounded +
opposite +  and alternate +
ascending +  and decumbent +
not fleshy +
filiform +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Chenopodium watsonii +
Chenopodium subsect. Favosa +
species +
1 +  and 2 +
0.3 cm3 mm <br />0.003 m <br /> (?) +
dehiscent +  and indehiscent +
glabrous +  and pubescent +
polygamous +, dioecious +  and monoecious +
not imbricate +
keeled +  and rounded +