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Montana Field Guide

Montana Field Guides

Prostrate Amaranth - Amaranthus blitoides
Other Names:  Amaranthus graecizans [misapplied]

Native Species

Global Rank: GNR
State Rank: SU
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:
C-value: 2

External Links

State Rank Reason (see State Rank above)
Native to parts of North America, may be introduced into Montana.
General Description
Monoecious. Stems branched at the base, prostrate to ascending, 5–50 cm with glabrous to pubescent foliage. Leaf blade obovate, 10–25 mm long, mostly longer than the petiole. Inflorescence axillary glomerules; bracts broadly lanceolate, 2–3 mm long with a spine tip. Flowers: sepals 3 to 5, narrowly ovate, acuminate, 2–3 mm long; stamens 3. Utricle 2–3 mm, as long as sepals; seed ca. 1.3 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
Across most of MT; native to the West but throughout North America, also completely naturalized in parts of South Amererica, Eurasia, and other regions (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX; Welsh 2003 in Fl. N. Amer. Vol. 4).

Observations in Montana Natural Heritage Program Database
Number of Observations: 11

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Disturbed soil of fields, roadsides, margins of streams, ponds; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
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    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Sirirugsa, P. 1973. Descriptive analysis of Montana species of Amaranthus. M.Sc. Thesis. Bozeman, MT: Montana State University. 56 p.
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Citation for data on this website:
Prostrate Amaranth — Amaranthus blitoides.  Montana Field Guide.  .  Retrieved on , from