Compilation
Amaranthus pubescens

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Name

Identification
Amaranthus pubescens (Uline & W.L.Bray) Rydb. [family AMARANTHACEAE ] (stored under name); Amaranthus graecizans L. [family AMARANTHACEAE ] Amaranthus crispus Greene. [family AMARANTHACEAE ]
Related name
  • Amaranthus pubescens
  • Amaranthus crispus
  • Amaranthus graecizans
Common name
  • white amaranth, Flora of North America Vol. 4
  • tumble pigweed, Flora of North America Vol. 4
  • Tumbleweed amaranth, Flora of North America Vol. 4

Flora

Entry for Amaranthus albus Linnaeus [family AMARANTHACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 4,
Names
Amaranthus albus Linnaeus [family AMARANTHACEAE], Syst. Nat. ed., 10, 2: 1268. 1759
Amaranthus albus var. pubescens (Uline & W. L. Bray) Fernald [family AMARANTHACEAE]
Amaranthus pubescens (Uline & W. L. Bray) Rydberg [family AMARANTHACEAE]
Treatment Author(s)
Sergei L. Mosyakin
Kenneth R. Robertson
Information
Plants annual, glabrous or glabrescent or viscid-pubescent. Stems usually erect, ascending proximally, rarely almost prostrate, much-branched, bushy (large plants forming tumbleweeds), 0.1–1 m. Leaves: petiole 1/2 as long as blade, or longer in young proximal leaves; blade obovate to narrowly spatulate, mostly 0.5 × 0.5–1.5 cm, early proximal leaves to 8 cm, base tapering, narrowly cuneate, margins entire, plane (or ± distinctly undulate), apex obtuse, with whitish or yellowish, subspinescent mucro. Inflorescences axillary glomerules, green, whitish green, or yellowish. Bracts of pistillate flowers subulate to linear-lanceolate, narrow, 2–3 mm, 2 times as long as tepals. Pistillate flowers: tepals 3, narrowly ovate to linear, slightly unequal, 1–1.5 mm, thin, apex acute; style branches erect; stigmas 3. Staminate flowers intermixed with pistillate; tepals 3; stamens 3. Utricles ellipsoid-ovoid, 1.5 mm, equaling or exceeding tepals, smooth proximally, coarsely rugose distally, dehiscence regularly circumscissile. Seeds dark reddish brown to black, lenticular, 0.6–1 mm diam., shiny.
Phenology
jun-aug (summer), sep-nov (fall)
Altitude range
0–2200 m;
Distribution
St. Pierre and MiquelonMexicointroduced and often successfully naturalized in South AmericaEurasiaAfricaAustralia.USA Ala.USA AlaskaUSA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Del.USA D.C.USA Fla.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA La.USA MaineUSA Md.USA Mass.USA Mich.USA Minn.USA Miss.USA Mo.USA Mont.USA Nebr.USA Nev.USA N.H.USA N.J.USA N.Mex.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Oreg.USA Pa.USA R.I.USA S.C.USA S.Dak.USA Tenn.USA Tex.USA UtahUSA Vt.USA Va.USA Wash.USA W.Va.USA Wis.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.B.Canada Nfld. and Labr.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.
Discussion
The name Amaranthus graecizans, which refers to a species of Old World origin, has been misapplied to both A. albus and A. blitoides in earlier North American floras and manuals.
Southwestern plants differing from typical Amaranthus albus in having viscid pubescence and usually distinctly crisped leaf margins may be recognized as var. pubescens; they were occasionally treated as a separate species, A. pubescens.
Amaranthus albus and A. blitoides are rather often confused in herbaria. The species are easily distinguished by their seed size and luster.
Native/Introduced
introduced;

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