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Montana Field Guide

Montana Field Guides

Coarse Sumpweed - Iva xanthifolia
Other Names:  Cyclachaena xanthiifolia, Cyclachaena xanthifolia

Native/Non-native Species
(depends on location or taxa)

Global Rank: G5
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 3

External Links

General Description
Marsh elder Taprooted annual. Stems erect, unbranched below, 30–100 cm. Herbage strigose to canescent; stem villous above. Leaves long-petiolate; blades ovate to deltoid, cuneate to cordate, serrate, 5–20 cm long. Inflorescence of numerous, branched, axillary racemes. Involucres 2–3 mm high; phyllaries 5 to 8, obovate, mucronate, villous, glandular. Female flowers 5, obscure. Male flowers 5 to 10; corolla ca. 2 mm long. Achenes 2–3 mm long, glabrate (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
Throughout temperate North America. Considered native to prairie states, adventive elsewhere (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 31

(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)

Streambanks, roadsides, agricultural fields; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
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    • Boggs, K. W. 1984. Succession in riparian communities of the lower Yellowstone River, Montana. M.S. Thesis. Montana State University, Bozeman, 107 pp.
    • Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
    • Fritzen, D.E. 1995. Ecology and behavior of Mule Deer on the Rosebud Coal Mine, Montana. Ph.D. Dissertation. Bozeman, MT: Montana State University. 143 p.
    • 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.
    • Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.
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Citation for data on this website:
Coarse Sumpweed — Iva xanthifolia.  Montana Field Guide.  .  Retrieved on , from