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Montana Field Guides

Small-flowered Marsh-elder - Iva axillaris

Native Species

Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 3

External Links






 
General Description
Rhizomatous perennial. Stems erect, usually branched, 10–40 cm. Herbage strigose, sparsely to densely glandular. Leaves short-petiolate; blades oblanceolate to obovate, entire, 5–50 mm long. Inflorescence of solitary pedunculate heads in axils of reduced upper leaves. Involucres 2–4 mm high; phyllaries 5 to 8, obovate, ciliate, strigose. Female flowers ca. 5; corolla ca. 1 mm long. Male flowers 4 to 20, obconic; corolla 2–3 mm long. Achenes 2–3 mm long, gland-dotted (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range

Year-round
 


Range Comments
BC to WI, south to CA, AZ, NM and TX (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 254

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

Recency

 

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



Habitat
Gravelly or fine-textured soil of grasslands, stream terraces; plains, valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • 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.
    • Peterson, J.G. 1969. The food habits and summer distribution of juvenile sage grouse in central Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 39 p.
    • Quire, R.L. 2013. The sagebrush steppe of Montana and southeastern Idaho shows evidence of high native plant diversity, stability, and resistance to the detrimental effects of nonnative plant species. M.Sc. Thesis. Bozeman, MT: Montana State University. 124 p.
    • Seipel, T.F. 2006. Plant species diversity in the sagebrush steppe of Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 87 p.
    • Tschache, O.P. 1970. Effects of ecological changes induced by various sagebrush control techniques on small mammal populations. M.Sc. Thesis. Bozeman, MT: Montana State University. 51 p.
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Citation for data on this website:
Small-flowered Marsh-elder — Iva axillaris.  Montana Field Guide.  .  Retrieved on , from