Chenopodium urbicum

Linnaeus

Sp. Pl. 1: 218. 1753.

Common names: City goosefoot
WeedyIntroduced
Treatment appears in FNA Volume 4. Mentioned on page 287.

Stems erect, simple or rarely branched, 3–10 dm, glabrous. Leaves nonaromatic; petiole 1.5–3.5 cm; blade mostly triangular or rhombic in proximal leaves, triangular, rhombic, or lanceolate in distal leaves, 3–11 × 3–10 cm, base truncate to broadly cuneate, margins sinuate to dentate (occasionally ± entire), often with obtuse to acute outward-pointing lobes at base, apex obtuse to acute, glabrous. Inflorescences glomerules in terminal panicles and lateral spikes or compound spikes, 3–4.5 (–8) cm; glomerules subglobose, 2–3.5 mm diam.; bracts absent. Flowers: perianth segments 5, distinct nearly to base; lobes broadly ovate to elliptic, 0.6–0.8 × 0.4–0.8 mm, apex obtuse or retuse, rounded or with slight broad keel abaxially, glabrous, only slightly covering fruit at maturity; stamens 5; stigmas 2, 0.1 mm. Utricles depressed-ovoid; pericarp nonadherent, papillose to smooth. Seeds rarely few vertical, lenticular, round, 0.8–1.2 mm diam.; seed-coat black (reddish-brown), shiny.


Phenology: Fruiting late summer–fall.
Habitat: Waste places, especially about cities and towns, along railroad tracks
Elevation: 0-600 m

Distribution

V4 535-distribution-map.gif

Introduced; N.S., Ont., Que., Conn., Del., Ill., Ind., Iowa, Maine, Md., Mass., Mich., Mo., N.H., N.J., N.Y., Ohio, Pa., R.I., Vt., W.Va., Wis., native to Europe, Asia, occasionally in other parts of the world

Discussion

Judging from its leaf morphology and anatomy, inflorescence structure, and floral characteristics, Chenopodium urbicum probably should be transferred to subg. Blitum, where it would occupy a position transitional toward subg. Chenopodium. Two rather distinct varieties are usually recognized: var. urbicum (= C. deltoideum Lamarck) with triangular leaf blades truncate at base, and var. intermedium (Mertens & Koch) Koch [= var. rhombifolium (Muhlenberg ex Willdenow) Moquin-Tandon] with rhombic leaf blades cuneate at base. Both entities occur in North America.

Chenopodium urbicum has been reported from several other provinces and states including British Columbia, New Brunswick, Louisiana, Oregon, and Washington. We have not been able to verify these locations.

Selected References

None.

Lower Taxa

None.

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

... more about "Chenopodium urbicum"
dehiscent +  and indehiscent +
Steven E. Clemants +  and Sergei L. Mosyakin +
Linnaeus +
slippery +
aromatic +
truncate +  and broadly cuneate +
Urbica +
3 cm30 mm <br />0.03 m <br /> (11 cm110 mm <br />0.11 m <br />) +
lanceolate +, rhombic +  and triangular +
3cm;10cm +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
City goosefoot +
N.S. +, Ont. +, Que. +, Conn. +, Del. +, Ill. +, Ind. +, Iowa +, Maine +, Md. +, Mass. +, Mich. +, Mo. +, N.H. +, N.J. +, N.Y. +, Ohio +, Pa. +, R.I. +, Vt. +, W.Va. +, Wis. +, native to Europe +, Asia +  and occasionally in other parts of the world +
0-600 m +
hippocrepiform +  and annular +
symmetric +, or +  and uniseriate +
dehiscent +  and indehiscent +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
subglobose +
Waste places, especially about cities and towns, along railroad tracks +
small white +
inflated +
4.5 cm45 mm <br />0.045 m <br /> (8 cm80 mm <br />0.08 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
sessile +  and petiolate +
nonaromatic +
lanceolate +, rhombic +  and triangular +
not fleshy +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
outward-pointing +
broadly ovate +  and elliptic +
0.4mm;0.8mm +
not winged +  and winged +
sinuate-dentate +, serrate +, dentate +  and entire +
sinuate +  and dentate +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
nonadherent +
papillose;smooth +
chartaceous +  and membranaceous +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Fruiting late summer–fall. +
pointing +  and ascending +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (?) +  and 0.12 cm1.2 mm <br />0.0012 m <br /> (?) +
round +  and lenticular +
Weedy +  and Introduced +
compound +, dense +  and loose +
cylindric +
not imbricate +
keeled +  and rounded +
branched +  and simple +
opposite +  and alternate +
not fleshy +
filiform +
0.1 cm1 mm <br />0.001 m <br /> (?) +  and 2 cm20 mm <br />0.02 m <br /> (?) +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Chenopodium urbicum +
Chenopodium subsect. Urbica +
species +
dehiscent +  and indehiscent +
depressed-ovoid +
glabrous +  and pubescent +
polygamous +, dioecious +  and monoecious +
not imbricate +
keeled +  and rounded +