Dysphania anthelmintica

(Linnaeus) Mosyakin & Clemants

Ukrayins’k. Bot. Zhur n., n. s. 59: 382. 2002.

Common names: Wormseed
Basionym: Chenopodium anthelminticum Linnaeus Sp. Pl. 1: 220. 1753
Synonyms: Chenopodium ambrosioides var. anthelminticum (Linnaeus) A. Gray
Treatment appears in FNA Volume 4. Treatment on page 270. Mentioned on page 269.

Plants annual. Stems erect to ascending, branched, 3.7–7.5 (–10) dm, ± glandular-pubescent, puberulent, or glabrate. Leaves malodorous, distal leaves sessile; petiole 1.4 mm; blade narrowly ovate to lanceolate, 5–7 × 1.5–3 cm, base cuneate, margins dentate with large, widely spaced teeth, apex acute, gland-dotted (rarely nearly glabrous). Inflorescences terminal and lateral spikes or panicles, 3–8 cm; glomerules globose, 2.5–3.3 mm diam.; bracts absent or leaflike, linear, to 2.2 mm, apex acute. Flowers: perianth segments 5, connate for ca. 1/2 their length, distinct portion ovate, 0.7 mm, apex obtuse, rounded abaxially, glabrous, covering fruit at maturity; stamens 5; stigmas 3. Achenes ovoid; pericarp nonadherent, smooth, glandular. Seeds horizontal or vertical, reddish-brown, ovoid, 0.6–0.8 × 0.8–1 mm; seed-coat smooth.


Phenology: Fruiting summer–fall.
Habitat: Sand dunes, pinelands, meadows, roadsides, and other waste areas
Elevation: 0-1100 m

Distribution

V4 492-distribution-map.gif

Ala., Ark., Calif., Del., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mass., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tex., Va., W.Va., Mexico, West Indies, Bermuda, Central America

Discussion

Dysphania anthelmintica is cultivated and locally naturalized elsewhere in the world. It is reported to not have leaves (pseudobracts) subtending the glomerules. In fact, it usually has very reduced leaflike bracts that are never longer than the glomerules. This species appears to be the most common representative along the Atlantic and Gulf coasts and is probably native to that region.

Selected References

None.

Lower Taxa

None.

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

... more about "Dysphania anthelmintica"
gland-dotted +
Rounded (?) +, Obtuse (?) +  and Acute (?) +
Steven E. Clemants +  and Sergei L. Mosyakin +
(Linnaeus) Mosyakin & Clemants +
slippery +
aromatic +
cuneate +
Chenopodium anthelminticum +
5 cm50 mm <br />0.05 m <br /> (7 cm70 mm <br />0.07 m <br />) +
narrowly ovate +  and lanceolate +
1.5cm;3cm +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
Wormseed +
Ala. +, Ark. +, Calif. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Md. +, Mass. +, Miss. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, S.C. +, Tex. +, Va. +, W.Va. +, Mexico +, West Indies +, Bermuda +  and Central America +
0-1100 m +
symmetric +, or +  and uniseriate +
unisexual +  and bisexual +
aromatic +
glabrescent +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
Sand dunes, pinelands, meadows, roadsides, and other waste areas +
foliose +  and linear-spicate +
spicate-paniculate +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
malodorous +
reduced +
not winged +  and winged +
entire +  and pinnatifid +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
nonadherent +
membranaceous +
1.4 cm14 mm <br />0.014 m <br /> (?) +
Fruiting summer–fall. +
0.7 cm7 mm <br />0.007 m <br /> (?) +
Ukrayins’k. Bot. Zhur n., n. s. +
pointing +  and ascending +
basal +, median +  and position +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
smooth +  and rugose +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
vertical +  and horizontal +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
cylindric +
opposite +  and alternate +
prostrate +  and decumbent +
erect +  and ascending +
not fleshy +
filiform +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Chenopodium ambrosioides var. anthelminticum +
Dysphania anthelmintica +
Dysphania sect. Adenois +
species +
polygamous +, dioecious +  and monoecious +