Tripleurospermum inodorum

Keys to Identification

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.