Dysphania ambrosioides |
Dysphania anthelmintica |
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epazote, Mexican-tea, worm-seed |
wormseed |
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| Habit | Plants annual. | Plants annual. |
| Stems | erect to ascending, much-branched, 3–10(–15) dm, ± glandular-pubescent. |
erect to ascending, branched, 3.7–7.5(–10) dm, ± glandular-pubescent, puberulent, or glabrate. |
| Leaves | aromatic, distal leaves sessile; petiole to 18 mm; blade ovate to oblong-lanceolate or lanceolate, proximal ones mostly lanceolate, 2–8(–12) × 0.5–4(–5.5) cm, base cuneate, margins entire, dentate, or laciniate, apex obtuse to attenuate, copiously gland-dotted (rarely glabrous). |
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 | lateral spikes, 3–7 cm; glomerules globose, 1.5–2.3 mm diam.; bracts leaflike, lanceolate, oblanceolate, spatulate, or linear, 0.3–2.5 cm, apex obtuse, acute, or attenuate. |
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 4–5, connate for ca. 1/2 their length, distinct portion ovate, rounded abaxially, 0.7–1 mm, apex obtuse, glandular-pubescent, covering seed at maturity; stamens 4–5; stigmas 3. |
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. |
| Seeds | horizontal or vertical, reddish brown, ovoid, 0.6–1 × 0.4–0.5 mm; seed coat rugose to smooth. |
horizontal or vertical, reddish brown, ovoid, 0.6–0.8 × 0.8–1 mm; seed coat smooth. |
| Achenes | ovoid; pericarp nonadherent, rugose to smooth. |
ovoid; pericarp nonadherent, smooth, glandular. |
Dysphania ambrosioides |
Dysphania anthelmintica |
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| Phenology | Fruiting summer–fall. | Fruiting summer–fall. |
| Habitat | River bottoms, dry lake beds, flower beds, waste areas | Sand dunes, pinelands, meadows, roadsides, and other waste areas |
| Elevation | 0-700 m [0-2300 ft] | 0-1100 m [0-3600 ft] |
| Distribution |
AL; AR; AZ; CA; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MO; MS; NC; NE; NH; NJ; NM; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; ON; QC; native to North America and South America; widely naturalized throughout the tropics and warm-temperate regions of the world
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AL; AR; CA; DE; FL; GA; IL; IN; KS; KY; LA; MA; MD; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TX; VA; WV; Mexico; Central America; West Indies; Bermuda |
| Discussion | Southern populations of Dysphania ambrosioides are native while those populations in the northern part of the flora area are introduced. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
| Parent taxa | ||
| Sibling taxa | ||
| Synonyms | Chenopodium ambrosioides, Chenopodium ambrosioides var. suffruticosum, Teloxys ambrosioides | Chenopodium anthelminticum, Chenopodium ambrosioides var. anthelminticum |
| Name authority | (Linnaeus) Mosyakin & Clemants: Ukrayins’k. Bot. Zhurn., n. s. 59: 382. (2002) | (Linnaeus) Mosyakin & Clemants: Ukrayins’k. Bot. Zhur n., n. s. 59: 382. (2002) |
| Source | FNA vol. 4, p. 270. | FNA vol. 4, p. 270. |
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