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Montana Field Guide

Montana Field Guides

Green Amaranth - Amaranthus powellii

Non-native Species

Global Rank: G5
State Rank: SNA
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Native to parts of southwestern North America, likely introduced into Montana. Seldom collected in the state.
General Description
Monoecious. Stems erect, often red-striped, 20–100 cm, branched above with glabrous to sparsely pubescent foliage. Leaf blade lanceolate to ovate, 2–8 cm long, mostly as long as the petiole. Inflorescence green, terminal and axillary, cylindric panicles; bracts linear-lanceolate, spine-tipped, ca. 5 mm long. Flowers: sepals 3 to 5, elliptic, 1.5–4 mm long with excurrent midveins; stamens 3 to 5. Utricle 2–3 mm long, shorter than sepals (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
In MT occurring in some of the western counties and Yellowstone County; native to western North America but now throughout the region (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 18

(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)

Cultivated fields, roadsides, stream banks; valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Boggs, K. W. 1984. Succession in riparian communities of the lower Yellowstone River, Montana. M.S. Thesis. Montana State University, Bozeman, 107 pp.
    • 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:
Green Amaranth — Amaranthus powellii.  Montana Field Guide.  .  Retrieved on , from