USDA
Code:
ANAR6
Legal
Status:
Colorado
List B Noxious Weed
Family:
Asteraceae (Sunflower)
Lifecycle:
Annual,
biennial or short-lived perennial.
Growth
form: Forb
Flower:
White, ¾ inch 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:
Can reach ½ to 3 feet tall and has 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, there is limited control
options because more spray is needed than can be used with
crops. 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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