CWMA

PO Box 419

Hotchkiss, CO 81419

 

970-361-8262

fax: 720-880-3051


Email:contact@cwma.org

 

 

Scentless chamomile

Tripleurospermum perforatum (formaly Matricaria perforata)

 

 

 

Family: Sunflower (Asteraceae)

 

Other Names:

 

USDA Code: ANAR6

 

Legal Status: Colorado Noxious Weed List B

 

 

Identification

Lifecycle: Annual, biennial or short-lived perennial.

 

Growth form: Forb

 

Flower: White, 3/4 in daisy like flowers that are solitary on each stem.

 

Seeds/Fruit: Indeterminate flowering habit, meaning flowers and seed are continually being formed. Each flower head can produce 300 seeds. A single plant can produce 300,000 seeds.

 

Leaves: Alternate, finely divided and fernlike.

 

Stems: 1/2-3 ft tall with numerous branches.

 

Roots: Large and fibrous.

 

Seedling: Seedlings emerging in spring can produce a dense mat, out competing other species.

 

Similar Species

Exotics: Oxeye daisy, Pineappleweed, and Stinking mayweed

 

 

Impacts

Agricultural: Main concern in hayfields and pastures. May cause blistering of livestock muzzles and irritation to mucous membranes.

 

 

Habitat and Distribution

General requirements: Prefers moist areas such as drainages, roadsides, streambanks, pastures, and fencelines.

 

Distribution: Throughout the U.S.

 

Historical: Introduced from Europe 60 years ago.

 

 

References

Whitson, T.D.(ed.), L.C. Burrill, S.A. Dewey, D.W. Cudney, B.E. Nelson, R.D. Lee, R. Parker. 5th Edition 1999. Weeds of the West. Western Society of Weed Science, in cooperation with the Western United States Land Grant Universities Cooperative Extension Services, Newark CA

 

van Laar, H.H., Bastiaans, L., Baumann, D.T., Christensen, S., Hatcher P.E., Kudsk, P., Grundy, A.C., Marshall , E.J.P., Streibig, J.C. and Tei, F. (eds). Proceedings, 12th EWRS (European Weed Research Society) Symposium 2002, Wageningen. EWRS, Wageningen, 2002, 438pp

 

Hinz, H. L. 1996. Scentless chamomile, a target for biological control in Canada : factors influencing seedling establishment. In: V. C. Moran and J. H. Hoffmann [eds.], Proceedings of the IX International Symposium on Biological Control of Weeds, 19-26 January 1996, University of Cape Town, Stellenbosch, South Africa, pp. 187-192.

 

 

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