Chenopodium macrospermum

Hooker f.

Fl. Antarct. 2: 341. 1846.

Introduced
Synonyms: Chenopodium farinosum Standley Chenopodium murale var. farinosum S. Watson Chenopodium macrospermum var. halophilum (Philippi) Aellen
Treatment appears in FNA Volume 4. Treatment on page 281. Mentioned on page 276.

Stems erect to decumbent, branched from base, 1–6 dm, farinose. Leaves nonaromatic; petiole 0.01–0.25 cm; blade deltate or trullate to narrowly trullate, rarely lanceolate, 0.8–6 × 0.4–3.6 cm, base cuneate, margins serrate, apex acute. Inflorescences glomerules in terminal dense spikes; glomerules subglobose, 3–5 mm diam.; bracts absent. Flowers: perianth segments connate into 0.5 mm tube; lobes deltate, 0.2–0.3 × 0.7–0.8 mm, apex acute, not keeled, glabrous, covering fruit at maturity; stamen 1; stigmas 2. Achenes ovoid; pericarp adherent, smooth. Seeds ovoid, 0.9–1.1 mm diam., margins rounded; seed-coat black, reticulate-punctate. 2n = 36.


Phenology: Fruiting Jun–Sep.
Habitat: Beach, dry lake and creek beds, marshes and muddy areas, waste areas
Elevation: 0-10 m

Distribution

V4 516-distribution-map.gif

Introduced; B.C., Calif., N.C., Wash., South America (Argentina), South America (Bolivia), South America (Paraguay)

Discussion

Chenopodium macrospermum is native and diverse in South America. Much, if not all, of the North American material is introduced from there and appears to represent more than one part of the variation. Until a reliable treatment of the South American material is published we are not assigning names to the variants in North America.

Selected References

None.

Lower Taxa

None.

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

... more about "Chenopodium macrospermum"
dehiscent +  and indehiscent +
Not keeled (?) +  and Acute (?) +
Steven E. Clemants +  and Sergei L. Mosyakin +
Hooker f. +
slippery +
aromatic +
cuneate +
Undefined subg. Blitum +
0.8 cm8 mm <br />0.008 m <br /> (6 cm60 mm <br />0.06 m <br />) +
lanceolate +, trullate +  and narrowly trullate +
0.4cm;3.6cm +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
B.C. +, Calif. +, N.C. +, Wash. +, South America (Argentina) +, South America (Bolivia) +  and South America (Paraguay) +
0-10 m +
hippocrepiform +  and annular +
symmetric +, or +  and uniseriate +
dehiscent +  and indehiscent +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
subglobose +
Beach, dry lake and creek beds, marshes and muddy areas, waste areas +
small white +
inflated +
sessile +  and petiolate +
nonaromatic +
not fleshy +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
deltate +
0.7mm;0.8mm +
not winged +  and winged +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
chartaceous +  and membranaceous +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Fruiting Jun–Sep. +
Fl. Antarct. +
pointing +  and ascending +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
verrucate +  and striate +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (?) +  and 0.11 cm1.1 mm <br />0.0011 m <br /> (?) +
horizontal +  and vertical +
Introduced +
cylindric +
not imbricate +
keeled +  and rounded +
opposite +  and alternate +
erect +  and decumbent +
not fleshy +
filiform +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (?) +  and 0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Chenopodium farinosum +, Chenopodium murale var. farinosum +  and Chenopodium macrospermum var. halophilum +
Chenopodium macrospermum +
Chenopodium sect. Degenia +
species +
0.5 cm5 mm <br />0.005 m <br /> (?) +
dehiscent +  and indehiscent +
glabrous +  and pubescent +
polygamous +, dioecious +  and monoecious +
not imbricate +
keeled +  and rounded +